Never say never but I don't see Steam releasing a "console" for 2 reason:
-They already did, it was the steam machine and whatever numbers they added to steam it was enough to not keep licensing the name.
-The Steam Deck is basically that, a lot of people actually use it as their gaming pc instead of just a portable device and it actually works great for a cheap "first time"-work in your living room kind of pc.
It's still up to know how committed MS is to xbox as a console but if they are still interested that rumor of they including steam on their consoles is probably the most intelligent move they can make. Spencer said it, they lost the generation where users built their digital libraries and steam is the biggest digital library there is, an xbox series s2 with steam would be the cheapest way out there for steam games. Still the fact is as much as people complain about prices, they aren't really that interested in "cheap". The idea of the series s on paper sounded like a killing idea but it sold less than the series x.