I always (well, nearly always!) enjoy perusing the posts on CRumors.
These are no exception.
For many years now, I've detected a real bias against Canon's M series of cameras and lenses...and in my view some of that bias results from ignorance--while resistance to change fits here as well.
This bias/ignorance was in evidence when many folks thought (hoped!?) that Canon's full-size mirrorless efforts would incorporate the EF mount.
Sadly for them...the R and its new mount was announced.
I'll re-state here again:
Canon's future, in the area of what we now call DSLRs/MILCs and their associated lenses...will be focused on two letters: R and M.
What many on this forum are calling for when they call for an 'APS-C' R...is, in my mind, a truly full-featured, tricked-out M body...that is nearly double the volume-and-weight of, say, the M5.
I completely understand the necessity of a physically larger body when attaching the big whites to it--Canon's 100-400 II (in my hands, well actually, NOT in my hands!), when mated to the necessary adapter/M6 duo...more or less requires a tripod (or at least a monopod).
That same lens, on a 5D MkIII, is a dream to hand-hold (and use, thanks to a wonderful implementation of image stabilization).
But other than these ergonomic reasons (and, perhaps, bandwidth-associated FPS etc. reasons), I don't understand the fascination with a crop sensor inside of a large mirrorless body. Surely folks aren't looking to extend the life of their EF-S 17-55 2.8IS, are they?! (Full disclosure: I still own this lens...and with an adapter...it works well for stills on the M6!)
As far as prices and economics are concerned...I believe that there's an R-based full-size sensor body in development that will sell for even less than the RP...with R-mount kit lenses to match.
Thanks for reading.