I agree with Unfocused. But sooner, rather than much later, they are going to have to bring the Cine line of sensor dedicated to video, functionality, to the DSLR mainstream audience or they will quickly lose their newly created spot to dedicated, but affordable, video solutions and to Nikon/Panasonic/et. al and or just other companies releasing EF mount dedicated video boxes, as we are already seeing.
Other than that, in the Pro/Prosumer line of things, the areas I see open for Canon, or otherwise, is bringing compact/mirrorless FF bodies and lenses to the mainstream pro/pro-sumer price-points and the same with Medium Format, getting it down to more mainstream price-points while keeping Canon's high standards of quality. Their other endeavors will either be with high-end film budgets or consumer budgets only in mind. The cross-over area, which is fully consumed by DSLR, only has the former options to explore so far as I can see. Actually, that's not entirely true, aside from finding ways to further bend physics for new unimaginable products, they can start to heavily bring down the prices of Telephoto lenses however I don't see where they currently have any incentive or pressure to do such a thing. I don't even have an interest in such photography on a personal level and any job would either afford a rental or have that equipment already, but it's about the only other thing I can think of on this...