Thank you for such complete response.
You addressed all my concerned and answered all my questions.
I am operating within a budget, but I don't want to invest into an obsolete system either, so you just confirmed what I feared, the new EOS R10 is the R Mount replacement camera for the M mount. Entry level, sub $1K offering form Canon.
Most of what I do is portrait and closeup photography, so I don't even need a kit lens, all I need is a nifty fifty or a macro 85mm or the like for the R mount.
I do need it for it record video at 1080P and I need for it to tether with Lightroom classic on a Macbook PC computer.
After some research today, for someone jumping into at this point, mirrorless and the R mount is the way to go for the Canon Brand, and the EOS R10 is the camera to join the new wave.
At this point am just checking prices and looking for the best deal.
some thoughts/observations ...
• You might want to pose this question in the R forum, in case you haven't already ... might be some valuable info/feedback that would help you with your search
• Initially, the M system did not have mature bodies nor very many lenses. The M system has since evolved into a very nice kit, especially for those who prefer the smaller form factor as well as a smaller price tag.
• The M (not unlike any other camera) does have a finite life that appears to be ending. Those of us who already invested in the M system want it to last as long as possible. Those who are looking at the M possibly recognize the value but may be reluctant to invest in a system that may not be supported in the future; hence, the reason to look to the future.
• The R system, especially the crop, is still growing - maturing. It may be a viable choice, but, for many, the lenses are not there ... yet. Not unlike the M's early days.
I currently have 5 M bodies and 8 M lenses plus I can use all of my EF lenses with the adapter. I also have an "obsolete" full frame 6D that I still use simply because it meets my current needs. At some point I may upgrade again - and the upgrade might be the R system, but until that time, the key components in my 2 systems take care of my needs quite adequately. Am I disappointed by the predicted demise of the M system? Absolutely, but not surprised. I've personally watched the evolution from 4x5 sheet film cameras to the digital cameras of today --and-- one thing is certain - the camera you use today will ultimately either break or become obsolete at some point. Doesn't mean it can't still capture great images but there's another, perhaps improved tool to accomplish the same.
Ultimately, you need to analyze your needs & decide how much you wish to spend. The R system may fit the bill but you may need a bit of patience if you're wanting lenses that are not yet available.