If one of these costs $3k, it becomes a pretty reasonable decision for a single person who's investing in a setup. Of course, if you want to have people over to watch a movie/game, that complicates things. I wonder if there will be a rental market for these, or how long it will take for enough people to have them that they would bring their own.
Our projector + Sonos setup feels obsolete on a going-forward basis. My guess is that in 5 years we'll use it only when 4+ people are watching something, and even then we'll be tempted to complain about how much less immersive it is, thanks to the hedonic treadmill effect.