Agreed, I guess what I meant was, as soon as they figure out a Mirrorless replacement for the 1DX II, it too will be replaced by mirrorless. The difference between DSLR's and Mirrorless is the mirror on DSLR's which IMO is a "weak point" of the entire system. Any moving part is subject to wearing out or breaking. Eliminating moving parts will create a camera that will/should last longer and be more reliable. Technology is rapidly progressing. The other stuff that comes with new cameras, such as EVF, Digic 8 Processors, etc, will come along regardless, as technology improves.

Hi Bob,
I believe the first SLR camera was a medium format and was introduced in the mid 1880s. It wasn't until the 1920s that smaller format SLR camera was available and the 35 mm came about in the mid 1930s. Lots of others came into being after WWII, particularly in the 1950s and 1960s. Likely the most popular mirrorless camera in the past was the famous Kodak Brownie camera introduced in 1900 and unbelievably was made in one form or another until the 1980s! If memory serves me correctly, Kodak sold well over 100,000 cameras in 1900 alone. I have no idea how many total were produced, but saying it was tens of millions is likely not far off. I remember the thrill of taking my first photos with a Brownie camera my parents had.
Doc Barry

Ha, lots of semantics and silliness on this thread. "Mirrorless" just means "camera without mirror" ergo that's what Ansel Adams used.... Meanwhile, in terms of terminology, i prefer the acronym "EVIL" - Electronic Viewfinder Interchangeable Lens".

That said, nobody here has moved beyond the concept of the traditional camera layout in their prognostications. Nowadays almost all cameras follow the same design format - a lens is positioned in front of the imaging chip whicn in turn is more-of-less directly in front of the user's eye. That may change in the future, as EVF becomes better (which it no doubt will, as technology advances at an exponential rate).

Imagine a camera where the lens/imaging chip assembly is completely separated from the viewfinder component. Canon made a pro video camera a few years ago (and may still offer it today) with the "viewfinder/control" screen connected to the lens/chip unit by a 10 meter cable, the purpose being to be able to set the lens/chip on the end of a boom and still have complete and immediate control. Fo course, virtually all drone mounted cameras follow this design - the lens is "up there" while you stand on the ground viewing on your tablet wirelessly.

So move that the the "real camera" world; at some point your "viewfinder" may well be a pair of AR or VR glasses with a resolution and reaction speed indistinguishable from real life (which cannot be said for EVFs today) while the lens/chip unit might be a cube that is 2" on a side. The point is that comments relating to ergonomics ("EVILs are too small", etc.) may be mooted by a completely different approach to camera design.

Further, the lens itself might be radically different from what we have come to think of as an optical system - flat lenses are being developed that might make for some major changes:

Here's an article from 2015: https://newatlas.com/ultra-thin-flat-lens-harvard/36207/

And here's something more recent: https://www.economist.com/science-and-technology/2019/07/25/how-to-make-a-flat-lens