"well, capitalism has issues, throw it all out!"
I'm saying that one of the conditions that capitalism springs from is wage labor. It's perfect for a system that uses price to allocate resources.
Unions fight to strengthen wage laborers. Welfare provides them with a basic social safety net. They augment wage labor.
Automation is coming. It isn't augmenting. It's replacing.
Maybe we get UBI. That creates a new social class.
Maybe we don't. That swells an existing class that started this discussion.
Either way, it's going to be quite a large change. Societies are a process, yes that process seeks stability, but every so often they hit an inflection point and tip in a new direction.
That's what gave rise to capitalism in the first place. It is a process that stemmed from a change in the patterns of human activity.