EOS R5 will be so expensive it will not sell well. Especially now with so many pro's and enthusiasts with less or no income.the only products that currently sell by boatloads is : surgical masks and disinfectants. oh, toilet paper was also flying of the shelf in land Downunder up until now.
EOS R5 crop mode is the only real alternative at this stage. albeit not at $1500 price mark. I am sorry to disappoint you. M7, 7d or R7 is not happening anytime soon if ever. take my words to the bank.
R5 also is a total overkill on video side (8k ffs) for majority of potential buyers. 5D audience is mainly stills photographers. And R6 specs sound "off track" as well. 20 MP meh. I dont need or want 50 MP, but will not accept less than 30-40 MP in a FF camera in 2020 and i am quite sure, many others will neither. Plus decent and affordable RF glass is a real requirement. not 8k. those who really need it shall buy a true video cam.
so, a fully competitive, sensibly priced EOS M7 as "hi end" option for M lineup would sell very well.
many many more people are able and willing to pay 1500 rather than 3500. especially for the next year(s).