Getting the 60th Wii u port 3 years into the switches lifespan drove me crazy as well. If you think that you would like the Steam Deck and that you would use it a lot then I would say just go for it. I use mine almost every day to play games and it has to be reaching a similar level of hours used to my switch in much less time.

I don't understand where the rumors of a steam deck 2 came from, (it may have been something they said just so people wouldn't dismiss it as something they would abandon) but it just doesn't make sense for them to come out with a new one. This thing is targeting around a ps4 game level spec and if the ps3 level graphics of the switch are anything to go by the next Nintendo console will probably be similar to the ps4 as well. This is going to be a direct competitor to said future Nintendo console, they just released it early for everyone to beta test it for them. Game consoles have about 6 year lifespans as well so I see this thing being relevant for years to come. They spent a lot of money on this and are selling it at a loss so I bet they want to get as many of them out there as possible. I bet we will see the OS get a general release and other handheld device makers start to release devices with the OS before we see another one from valve.

As far as devs not making games that run well on it I honestly hope that as the userbase gets bigger that we may start to see more games made with the decks performance in mind. It would also be good for the low spec PC gamers in general as well. But there is such a massive backlog of great games on the steam store that I really do recommend you try this thing, you won't regret it.