Also bear in mind that physical room layout is an issue, for any room that's not a dedicated theatre.
We have a 55" OLED screen, which sits on its stand in a bay window. A bigger display wouldn't physically fit the space.
For movies, though, we also have a 120" projection screen mounted to the ceiling, which can be dropped down for the duration of a film, and retracted otherwise. It practically divides the room in two; there's no way we'd want a fixed screen of that size all the time, but it does give a genuinely cinematic experience when needed.
I'm waiting for the industry to come up with the 'projector-less screen' - a large format OLED (or whatever) panel printed onto a flexible substrate, that can be deployed when needed and rolled up out of the way otherwise. We've already seen the phone industry start to experiment with smaller flexible screens, so it's not as though it's a technology that's completely in the realms of science fiction.