Thom from Sans Mirror speculate on the mirrorless market in 2019 (archived). He gives us a manufacturer by manufacturer play:

Clearly, all the camera makers — other than Pentax, who’s still wandering around in the woods somewhere seeing if trees make noises when they fall — are going to be executing significantly in the mirrorless realm in the future. We’re now clearly into the DSLR-to-mirrorless transition period. How long that transition will take depends upon how fast the camera makers move.

This is what I’m predicting too: DSLR is down, mirrorless is up. It is a technological move and while it will not fundamentally change the way we use cameras, it will definitely shape its evolution.