I would say I'm more optimistic than you about post-scarcity. Bertrand Russell makes a case for the insanity of modern society by noting that during WWI half of British populace was sufficient to produce enough for all of Britain. Even if we allow for some margin of error in his statement, since that time productivity in the US has increased 4.5x since then.
To me the show is increasingly relevant. For example, it presents a clear answer to a popular criticism to UBI: what is to prevent everyone from staying home to play video games and leeching off society?
The optimistic answer is that once society can produce enough goods for everyone, the traditional value system of society (material wealth => proxy for contributions to society => virtue) loses meaning and will be overtaken by new ones (contributing to society => virtue).
I agree with most of your summary except the end. What if the problems in the US and around the developed world are more due to how society is organized rather than technological? I think the Star Trek value system is appealing and IMO something we ought to strive for.