If the PS5 is fully retrocompatible with the PS4 then I might consider it. There are a few PS4 exclusives I really want to play, and there are bound to be a few more during the PS5 generation, so, maybe.
But as things stand, I'm fine with the Switch+PC.
Edit: also, there's already a Xbox "Series S"? I don't even know what that's about. Microsoft really sucks at getting their stuff across, each new console gets more confusing than the last.