The novelty wears off. My kids have free roam to use my projector for gaming. My oldest did for a while, and sometimes still does, yet his preferred way of gaming is on his bed, with phone and laptop next to him, playing on a 42" TV.
Movies we watch in the living room, closer to the kitchen lol. Only when visitors come over that haven't been here before there's interest in the projector.
I used it for nearly a decade before I got bored of it, so did get lots of use out of it. Actually the release of PSVR had me no longer turn on the projector. Also with HDR, playing games on a projector you see so much less detail due to crushed/grey-ish blacks. The bigger screen is cool, but there's so much more shadow detail on a good TV.
Actually last game I played on it fully was Horizon Forbidden West as its HDR implementation and sharpened detail at release was so over the top it gave me migraines on TV. Playing it at 1080p SDR was a lot more comfortable, so I used the projector to play it on.