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If I was Canon/Nikon and was on the lookout for a new mount, I would make the new mount for curved sensor, this is the way to progress ahead.
Sony just revealed a bunch of Curved sensor lens designs.
The amazing part about this is all the lenses have 4-6 glass elements at most.
These lens designs are all super simplistic. They are easy to manufacture with high precision.
From what we have seen, wide angle DSLR lenses become so much better, and yet so much lighter when they are made as wide angle mirrorless lens.
But this step is an even larger difference than from DSLR->mirrorless, these lenses are far more simple, they will be even lighter than the current mirrorless lenses, and corner sharpness will be greater than ever.