Interesting discussion about market share and profitability. I think most of it is right. We won't see any more non L EF primes. EF-S? Sure.
Canon really can do no wrong with it's latest rounds of L lenses, say since 2008. Thing is most of them are super teles and out of reach for mere mortals. Where Canon should innovate on the current prime lens lineup is in corner sharpness wide open, chromatic aberrations, and vignetting. I'd pay more and carry heavier primes if Canon could make these lenses mightier and even add IS.
I would love to be able to add a few primes to my bag including:
35 1.4 IS, better corner sharpness, lower CA, faster AF
85 1.4 IS, faster focus than 85 1.2, better corner sharpness wide open, lower CA
I'd pay $2k each for these lenses.