Yep, Steam Machines were basically that, but just a PC that ran SteamOS. I think they could come back to moderate success now where they kinda failed before.
No one bought them before, and since literally nothing has changed since then besides graphics card prices, no one will continue to buy them if they get re-released.
If their pricing and performance is comparable to premium consoles, and your whole Steam Library automatically carries over, I definitely think more people would be interested.
What’s crazy was that they performed better than consoles at the time compared to price, and people still didn’t buy them. So no, you’re wrong people won’t change and it still wouldn’t sell