Canon glass is what it has over them whether you have existing glass or not. That and ergonomics + DPAF.
Is this more than a meme? Anyone have actual numbers? The bottom end of the 35mm film SLR market, before digital took over, would seem to prove that an SLR is not expensive to manufacture. Heck, some of those bodies may have been cheaper than an EVF all by itself.
You've never looked at CIPA sales reports, have you?
Yeah, if only mirrorless cameras were much cheaper and had features they don't, and were just better the things they're not so good at, we'd all have them and never look back.
It's just goalpost shifting: mirrorless cameras were going to totally dominate DSLR until they didn't, when it became all about full frame mirrorless, until everybody made them, and not it's all about them not being good enough and cheap enough.
If DSLRs were going to spiral to a quick death, it would have started with APSCs, but t6 remains firmly the best selling crop ILC. It really doesn't matter how many hundreds of times AvTvM/fullstop/Mirage and the like repeat it, mirrors and optical viewfinders aren't going to go to the grave anytime soon.
The a6500, m6 and m50 are all super capable cameras, yet DSLR crop cameras soldier on. If they can't do it, how are $2000+bodies going to?