I think it's the resolution that will kill dvd's. 55" TV's are now entry level. A cinefile in ten years may well have an affordable laser projector filling and suddenly see the merits of 4k.
Perhaps, thought blu ray is looking a little laserdisc like. Never quite got the mass adoption to stay around and now fading away. It's now hard to buy a cdrom drive without dvd support. But ones without blue ray remains common. Notmto mention second hand dvds are available for pennies on bulk for hoarders ...
No streaming service matches the quality of 4K blu-ray, and often they look worse even than regular blu-ray.