You're going to regret your decision either way. If you buy the camera, you'll wonder if you did the right thing and will almost certainly yearn for a different model that's introduced sometime in the future. If you don't buy the camera, you'll be left wondering what you missed by not having it.

No one knows what Canon has up their sleeves. There's a lot of talk that the next EOS R-series will be an ultra high resolution model... essentially a replacement for the 50MP 5DS-R model. There's talk of at least 75MP and maybe even 83MP images! Either of those will require ultra-high quality lenses and a very powerful computer to work with! Will it be two models like the 5DS and 5Ds-R, one with a standard anti-alias filter and another with a cancelled filter? Does that count as two of the expected future models, or one? (Canon actually has three current R-series models... besides the EOS R and EOS RP, there is also the EOS Ra, which is a variant of the R especially designed for astro-photography.)

There's some speculation that there will be a new entry-level model "below" the EOS RP. But it's pretty hard to imagine a full frame mirrorless for under the current $999 selling price of that camera. (That's a discount of $300 off the original $1300 list price.)

Maybe a future R-series will be a lower resolution, high frame rate mirrorless intended for sports/action photography... much like the 1DX Mark III, but delayed until late in the year since that camera has just been introduced.(Supposedly the 1DXIII's AF system is a "game changer" and at least partially based upon what Canon has learned making the AF systems for their R-series and M-series mirrorless. We can expect some "trickle down" tech from the 1DXIII into both the mirrorless and DSLR models. BTW, when it was introduced around 15 months ago the EOS R's AF system was claimed to be "the fastest in any camera, ever". I wonder what they'll call the sports/action oriented R-series... "EOS RX" sounds like a prescription medication or drug store!

There's talk of an EOS "RS" or "R5" in the works. Since "S" and "5" look a lot alike, it's possible that an advance copy in testing seen from a distance was misread , causing the confusion about that naming. I thought Canon was getting away from number designations with the R-series. And I also thought Canon would be likely to reserve "RS" for an ultra high resolution model, as they've used the "S" suffix for those in the 1D and 5D series cameras. Early rumors are that this is a 40MP or 45MP camera (i.e., not the ultra-high rez model), that it has in-body-image-stabilization (which I think would be a first for a Canon interchangeable lens camera), and that it can shoot 12 to 14 frames per second (20 fps with focus locked) which are more than double the rate frame rate of the EOS R. Supposedly the R's "touch bar" has been replaced with a scroll wheel (like many of the DSLRs), and that it will be able to shoot 8K 30fps video as well as 4K 60fps and even 4K 120fps (might be cropped). Supposedly there will be a higher capacity battery available too, although it is said to follow the same format as the LP-E6/E6N currently in use in the R and numerous DSLRs (no idea if it will be backward compatible to those other models, in the same way the LP-E6N was when it superseded the earlier LP-E6). It's possible this model may be announced as soon as next month.... Perhaps just prior to CP+ opens in Tokyo on Feb. 27th. Canon has timed announcements this way in the past. No pricing has been mentioned, but with specs well above the EOS R, one might expect the introductory price to be somewhat higher than that camera's $2300 introductory price.

Maybe one of the future R-series won't even be full frame.... Nikon just introduced an APS-C Z-series model: the Z50 (21MP). It's their third Z-series model behind two full frame: the Z6 (24.5MP) and Z7 (46MP). Sony has both APS-C and full frame mirrorless models. Canon has their M-series APS-C mirrorless, which have been in production for eight years, but can't share lenses with the R-series. I'd be surprised if Canon didn't consolidate the two distinct mirrorless lines into one, some time in the future. They have said there are no crop only RF lenses in the works, but an APS-C camera could use the full frame capable RF lenses, as well as the entire EF and EF-S line via already-available adapters. I think it's not a matter of "if" Canon will fold their two mirrorless systems into one... it's just a matter of "when". But, hey, what do I know!

It's almost certain there will be an EOS R "Mark II". But when that will be introduced and how it will differ from the current model is anyone's guess. Maybe the "RS/R5" described above is intended to supersede the EOS R.

I'd recommend you closely look a the available models, read the in depth reviews, compare to what you have now and decide if the current models offer substantial improvements in some ways that would be helpful to you.

General info, mirrorless versus DSLR:
https://www.techradar.com/news/mirrorless-vs-dslr-cameras
https://www.digitalcameraworld.com/features/dslr-vs-mirrorless-cameras-how-do-they-compare
https://www.bhphotovideo.com/explora/photography/buying-guide/dslr-vs-mirrorless-which-is-best-for-you
https://kenrockwell.com/tech/mirrorless-vs-dslr.htm

When reading the above (and other) sites, keep in mind that going from a relatively lightweight DSLR like the 6D to a full frame mirrorless like the EOS R won't make all that big difference in size and weight. There's far more difference in size and weight with the smaller APS-C format cameras. Full frame mirrorless lenses, for the large part, also don't save much or any size and weight.

Also consider things that might not be obvious or highlighted in any way. For example, compared to DSLRs, mirrorless get far fewer shots per charge due to the heavy power usage of their electronic viewfinders. This may or may not matter, depending upon how many shots you typically make in a day. I also worry when its lens is removed about the vulnerability of the image sensor in mirrorless, which isn't recessed nearly as deeply inside the camera and in most cases isn't protected behind a mirror and a shutter the way it is in a DSLR.

Some good sources of more Canon-specific info include:
https://cameradecision.com/compare/Canon-EOS-6D-vs-Canon-EOS-R
https://www.apotelyt.com/compare-camera/canon-6d-vs-canon-r
https://www.the-digital-picture.com/Reviews/Canon-EOS-R.aspx
https://www.the-digital-picture.com/Reviews/Canon-RF-24-105mm-f-4L-IS-USM-Lens.aspx
https://www.the-digital-picture.com/Reviews/Canon-RF-24-240mm-F4-6.3-IS-USM-Lens.aspx

There are plenty more sites and reviews. Have fun!