I don't think Canon will enter this end of the market. I think it would be in the benefit to make a licensing deal with Zeiss and/or Schneider for AF technology. Once canon moves into the 40+ MP range the weakness in their lenses will become very apparent. I don't Canon will make dramatic improvements to their lenses (L+ series?) but allowing a 3rd party to provide ultra high quality glass, would be in the benefit.
Right now they have lost landscape photographers to Nikon. A 40+MP and some Zeiss/Schneider glass (not sure they will need AF but others who want 40+ MP such as model photographers, ..) could use AF
Have you tried any top Canon lenses on a 40+ MP body?
None of the lens testers have, but a 7D had a 42MP equivalent sensor. And now the 70D and 7D MK II have sensors that are equivalent to a 51.7 MP FF sensor based on photosite density.
I don't expect to see a issue. People were complaining that Canon lenses could not resolve a 20 MP Body when the 1Ds Mark 3 came out, based on what? Lack of information and fear of the unknown!
I don't expect a problem with a high MP sensor, resolution of the image will increase. My issue is processing time. With newer computers and SSD's, that concern is easing as well.
If Canon are so great, why would anyone pay extra for a Zeiss lens?
I can think of a few reasons:
1. Zeiss lenses for Canon are MF lenses. It have finer adjustment in MF than the EF lens.
2. Better and smoother out of focus area due to almost perfect round diaphram.
3. Perception, German designed product is better than Japanese designed product.
4. To show off the deep pockets, mine is more expensive than yours.