That's one way of looking at it. Another is that humans will find other ways of exploring and spending time that doesn't necessitate productivity. I would love to be FIRE, for example. A lot of people will love it. Some won't, and they will work.
I think UBI is not there yet, but a hallmark of this is the rise of influencers and time burned on media and Netflix. This tells me that leisure time is rising and we have the economic capability of sustaining non-productive activities.
But we're not there _yet_. I don't fear the inevitability of UBI in my lifetime for example. But I'm confident we'll be able to devise a useful system when we get there. In the end, we didn't have capitalism untill we thought up this system. There is surely another kind of system we could have converged to, I seriously doubt it's some magical rule of nature. But we did not, we wound up here. We'll end up in another place at some point.
