Canon is making a big mistake since they seem to think that mirrorless systems are of far less importance. IMO they clearly are the future, well the present actually, and they will shortly sell more than DSLRs. That's already true in Korea in fact. I find that position surprising from Canon.
I think the big issue is gauging in what areas mirrorless is a threat to there existing business.
Personally I don't see FF mirrorless as a threat to EF mount in the short to mid term and maybe not even the long term. Besides the issues of lens balance, battery life and the level of manual controls FF users tend to want I think were also seeing with the Sony FE system that ultra small flange distances aren't a good idea for larger sensors.
ASPC is IMHO going to be the key battleground as I think the size saving potential is greater and the demand for smaller bodies is higher. Even there though I would say that I think part of the reason why higher end m43 and Fuji products have found a market is because Canon and Nikon haven't really gone after that market. I'm guessing they've booth been trying to funnel higher end sales to FF(or ASPC users shooting FF tele's) but I don't see any reason we couldn't see a smaller ASPC body with better build and more advanced controls(Nikon have fitted a high level AF sensor into there D5xxx bodies now) plus release some EF-S primes.
I suspect the really key areas will be firstly in the far east the really small ASPC/m43 mirrorless bodies that compact/phone upgraders might buy and in the west more the mid level ASPC/m43 mirrorless that might target the same market as entry level ASPC DSLR's. Again for me I think you could argue that Canon have started to lay a good framework for ASPC mirrorless with its lens lineup, its tiny compared to there rivals but it seems to be targeted more to your standard users.
Sony's Achilles heel for me has always been the way they treat users, under designing kit lenses to push people to buy overpriced upgrades is not the way to get long term customer confidence.