Future of pc gaming will change but more akin to fragmentation.
There are cloud enthusiasts, who would want to either stream from their own pc or from cloud services towards a tv or specific devices, like tablet or Phone.
There are mobile gaming, that would be the ones on handhelds, which would fit sw2, steam deck, ayaneo, legion go, msi claw, asus ally and so on. But those will be a bit “blurry” due steam OS provides better interface for portables, while windows devices are pretty bad.
Home entertainment, like living room. Also, linux/unix are better suited for it. Which is why sw2, steamdeck were more suited for it.
Consoles dominate the living room, due lack of options on pc. But at same time, those devices have specific purpose.
Less folks are going towards actual desktops or laptops. Unless they use it also for work, some avoid gaming on it entirely due avoid mixing work and gaming.
So, is plausible that consoles and gaming will shift towards entertainment hubs. Which is why most consoles are pc these days but the UI/UX of microsoft(pc) for it is nightmarish. Steam solution is way better on this regard.
I see a shift towards dedicated home systems as leaning towards linux, but distros properly optimized and structured for it. I mean, ps uses unix, switch uses linux, android uses linux, xbox uses windows. If ms decide to not keep doing xboxes could be a good thing to consider linux-based device with gamepass/xbox cloud features.
So, I see more desktop users being the ones who also work with it. Living rooms with consoles or deck-like devices, which also can be used on the go, depending on the need of the user, that or having a ecosystem compatible between devices.
I wouldn’t consider steam as the way, but their OS is one of the most promissing ones out there.