I personally don't believe mirrorless are the future. I think mirrorless is a transitional technology between the current high end cameraphone (i.e. Lumia 1020) and the cameraphone of the future.
Think about it. Even these Sony cameras, at the top of their game, make major sacrifices for the small body size compared to the best DSLR. So, while fun for travel, wouldn't a pro opt for the best of the best to be at the top of his game? While mirrorless will evolve, so will cameraphones... And while mirrorless cameras are small, the lenses are still huge.
Thus, as cameraphone tech evolves, you could eventually have your phone as a crop replacement that is with you 100% of the time. Not many people are going to carry around both a phone and a camera 100% of the time. The phone will get the shots your camera would miss.
So then, IMO, you will have DSLR or maybe a DSLR hybrid that has some of the benefits of mirrorless builtin but none of the disadvantages for your camera, and your phone for when you don't have your camera on you.
While mirrorless is small, it is still too large/inconvenient to carry everywhere all the time; and, even the best models are still not up to par with the best DSLRs. Thus, I see the pro market keeping DSLR, the consumer market eventually going 100% phone, and enthusiasts having both. I don't think it is a coincidence that as recently phones are coming out with larger sensor 20mp-41mp models, mirrorless has seen its growth stunted. Mirrorless I believe will remain a niche because of these two forces neither of which mirrorless is master of - it is nowhere near as portable as a high MP cameraphone, nor does it have all of what the best DSLRs offer. Jack of all trades but master of none.
So I actually would say Canon is wise to stick to its guns with DSLR, but it needs to keep pace in releasing new DSLR tech to keep people interested and spending money on DSLR