I don't think Canon will come out with anything beyond 45mpx unless people clamor for one. The better chance will be something like an R7 (7D2 replacement).
I don't want an 83MP FF just for the crop mode, though; I actually want to take 83MP images, as a fully-used FF camera. The lack of color moire would be significant, allowing you to strip out one color channel for a barely alias, pure B&W image with a red, green, or blue filter without a grotesque level aliasing.
Part of the problem, I think, is that Canon perceives the market (correctly or incorrectly), as wanting good video and fast burst rates, in every camera. I would think that 83MP FF would be lot easier to design if it only had line-skipping video, and 3 or 4 fps bursts. I'd be very interested in a camera like that. I hate line-skipped video, but if that is the only way to get it a reasonable bandwidth and manageable level of computation, then I will not use that body when I want to opt for video, or use a less demanding crop mode.
