I have all 3 of the major consoles since their respective launches and a well-spec'd gaming machine from 2019. In the year I've had the Steam Deck, I've played more games on it than all other systems in my house combined. Second place goes to the Switch. I can't even remember when I last turned on the Xbox. I've also started and finished more games this past year than the couple years prior to getting the Deck.

There are a couple things I've noticed that makes me play the Deck more. First, being able to play on the couch while others are watching the TV helps a lot, although this is also true of the Switch. Also, emulation is so easy on the Deck, I find myself picking smaller sessions of older games (mostly SNES and GBA).

I have a couple of other hobbies that consume my free time. Since getting the Deck, I've allocated more time to playing games on the Deck and a bit less from the other hobbies.

I'm not sure what would make me buy the next generation of other consoles. It'd need to be something fairly compelling, but I don't see a gap in my personal gaming that's going unfulfilled. I think I could slim down to just the Deck or its successor for the next gen (and maybe the gaming PC, depending on performance).

One significant attribute that I suspect separates me from many other gamers is that I have nearly zero interest in games that are heavily oriented towards online multiplayer, like most FPS. This keeps social network effects from pulling me into any one of the consoles. Some of these have games cross play, but that wasn't the majority a few years ago.