tcthome Loc: NJ

You have gotten plenty of advise as why not to switch. If you made your mind up, The Canon R6 or R5 would probably be best & would be an easier transition. If you are looking for high mega pixels (you need to be on your game, shows every little fault if you are not) the Sony 7R4 was down to $3k last I looked, IMHO, you can't go wrong with either of these brands if you are talking buying all new lens for your new camera. Nikon's AF isn't as good as the Sony or Canon systems. Either way , good luck & enjoy your new equipment.

Delderby Loc: Derby UK

As a casual "outside" observer with no bias, if you decide to change and stay with your format, look at Sony and Fuji.

tcthome Loc: NJ

If you are looking for trade in value for a new model camera, it is always best to trade up or sell as soon as the new one is released. As time goes on the camera stores have more of the traded in model & will offer you less. Either way, selling to a store might be less of a hassell but your going to a bigger loss compared to selling it your self.

traderjohn Loc: New York City

If you are not "unhappy" with your D500, why change?? I don't know if "ALL" new cameras will be mirrorless. As a group DSLR and mirrorless have been affected by cell phones and their ability to take some fantastic pictures also changing views regarding the need to carry around these cameras and assorted paraphernalia

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billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

If your selling your equipment, you can sell it here without commission costs. But, I caution you to require Paypal for payment. It protects you and the buyer equally. You can also sell on Ebay, I personally have over 800 transactions, (buying and selling) and have had very very few problems, and those problems were easily solved through Ebay and paypal.
As far as a recommendation goes, I own Nikon and Sony mirrorless, both are outstanding, of course, if you stay with Nikon, with the Nikon adapter you can use your current Nikon lenses to start you off so the initial investment will not be that high.
Good luck and keep on shooting until the end.
Below is a shot taken with your Nikon D500 with the Nikon 500mm 5.6 FL. Mirrored camera's will have a long life and the results will be outstanding.
Black Crowned Night Heron, Nikon D500, Nikon 500mm 5.6 FL, 1/4000 sec. f5.6, ISO 800. Don't sell your D500 short, it is capable of great images.
Good luck and keep on shooting until the end.

pila

Strongly agree with your assessment.

Delderby Loc: Derby UK

Great pic - great camera, hard to beat. But - EVF is the photographer's aid to better pics.

Nosaj Loc: Sarasota, Florida

When choosing a camera, if you have to as, you don’t need to choose!

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

I do not disagree. EVF have there place. My point is if the photographer is skilled any thing will work.
I do own and use mirrorless, the image below was taken with the Sony a9 with the 200-600 lens.

gorgehiker Loc: Lexington, Ky

I don't think that you can go wrong with any modern camera from Nikon, Canon, or Sony. My D850 was so heavy and difficult for me to lug around. I am so glad that I switched to the Nikon Z system. Switching to the Z system made photography fun again for me. Read the camera reviews, but also read the lens reviews. The Z system lenses are incredible!

Canisdirus

If that is the way you wish to go...
Canon or Sony...probably in that order.

Baysitter11 Loc: Cincinnati

anotherview Loc: California

Canon offers an adapter for its DSLR lenses to work on its mirrorless cameras. So you can keep your collection of Canon lenses.

For my part, my DSLRs produce high-quality images. The information may exist out there showing without question that mirrorless cameras produce substantially better image quality over DSLRs, but I haven't seen such information so far. I do detect plenty of hyperbole and sales talk favoring mirrorless cameras.

The situation reminds me of when video became available for DSLRs. The shills praised and promoted this technology as if all camera-owners just had to have it; otherwise, they'd find themselves morphing into dinosaurs in the marketplace. Videography presented the future.

It turns out, however, that doing videography involves buying more gear. And it means doing planning for a shoot, using a story board and other aids. The cameraman has to direct his subjects for best results. Videography has a lot in common with filmmaking as a process. Both differ from still photography, as always.

I wonder how many still photographers bought into the sell-jobs for videography yet never succeeded with this approach to image-making? I suppose they sold their video gear or set it aside to gather dust.

Please understand that I'm not stuck in the mud. Mirrorless cameras will eventually take over most of the camera market. For the time being, my DSLRs serve my purpose in still photography.

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

Sony, Nikon, Fujifilm, Panasonic, Olympus, Leica, or Canon... probably in that order.

olemikey Loc: 6 mile creek, Spacecoast Florida

Buy Tums, you have GAS. All current/existing cameras will be worth less in years to come, including MILC (Cameras are very much like used cars, they start losing value the minute they leave the dealer) - if you trade in you will lose quite a bit of $$, so sell them outright yourself. If you shoot by viewfinder, make sure you get one with a viewfinder, shooting looking at the rear LCD sucks (my experience to date) unless you are in a museum/zoo/studio....it sucks using one in bright sunlight (I have two, one with/one without VF...basically only use the one w/o VF indoors-that is me, YMMV). Buy and use what you like - it will be interesting to hear how you feel about it a year from now (money well spent - or money that didn't need to be spent - and will your pics be any better). Let us know. Good luck in your quest.