As it usually happens with big corporations, it's taking much longer than anticipated. It's happening nevertheless: there's no room for mirrors in the future of mainstream photography.
They were just a patch to solve a problem that doesn't even exist with today's technology. They are irrelevant and unnecessary.
And that makes them cool.
Just kidding. Kind of.
The reason why I shoot film is because it's the only way I can make images with a tool like the Bronica.
For the same reason, plenty of people will keep using their DSLRs because it will be the only way to get that experience. Mirrorless cameras are lighter and smaller, they bring a lot of advantages but they change the way we take photographs.
And of course, there are people who'll embrace the flaws of DSLRs, especially the early ones that came out years ago.
DSLRs are the new film. They are about to become a niche in photography, used by some only because of the unique experience (and probably look) you can achieve with them.
I'm excited about it.