DSLRs have been around for a couple of reasons, one of which being that the PDAF focusing units in the bottom of the camera work better in low light than contrast based focusing on the sensor — but now there are sensors with PDAF. Another reason is battery life. Some photogs much prefer OVF to EVF even though that means no WYSIWYG or active histograms.

The thing that’s going to kill DSLRs is that now that the pros and cons are a bit of a wash (won’t get into that — you’re welcome) is that pentaprisim/mirror mechanisms, like other mechanical devices that need to be adjusted to the micron, are expensive to build. ML ILCs will eventually be cheaper than DSLRs.

There will still be a DSLR market — but it’s going to be upmarket (think single-digit Nikon models). The D750 successor won’t be cheaper than the Z6 successor… eventually. I say ‘eventually’ because the current DSLR models have already-paid-for factory tooling. But cheaper-to-build will translate into cheaper-to-buy.

FWIW, ILCs are hardly lighter with a mirror mechanism removed — most of the weight is in lenses and they vary in weight based on the sensor size. Yes a larger diameter mount means there’s less refraction needed to make light rays perpendicular to the sensor (something film wasn’t really sensitive to) so a slightly lighter rear element, but that’s about it.