if the technology was there to replace it. Soon i believe it will be.
And this is pretty much the crux of the whole thing - at the moment, the technology doesn't exist to replace it. Will it soon? Eh, who knows. But until then the DSLR will remain.
Then of course once you do see units out on the market that can replace a DSLR, well even then you won't necessarily see a huge tidal shift. I'm quite happy with the size and weight of my current equipment, given the fact that replacements that could match them in the mirrorless realm would be WAY more than I would ever consider spending on my hobby.
Even when they do eventually get to the point where they make replacements in the mirrorless realm that I can afford, I'm probably still not going to be in a rush to switch. I prefer something larger that I can manipulate easily - smaller for me is not always better, in fact it often becomes a nightmare quickly with repeated use.
The other point of course will be will whatever new system the come up with use my current lenses? If not, total deal breaker for me and a lot of other folks out there right from the get go, and no I don't want to spend a small fortune on some kind of adapter to get AF working so that I can mount a dinky little camera on the end of a 70-200 F/2.8 or 400mm/500mm/600mm lens of some sort so the whole system is off balance and terribly unweildy. So yup, no interest for me there either. So really what it boils down to for me is I'll consider switching, maybe, at some point, when it can actually replace what I already have.
Until then it makes zero sense for me, and a lot of other folks, and at this stage I don't even recommend people buy them as their primary system other than in very limited circumstances, because lets face it - there's zero guarantee that the stuff available now will even be supported next year, or 3 years from now, etc.
For the folks that really like/want a smaller system and are willing to deal with all of that, great. But it's not anywhere near the stage where it will replace DSLR for some of us, much less all of us.