Many times in science fiction, it has been considered what would happen if there were essentially unlimited resources (fusion energy, direct transformation and manipulation of matter)and general wealth. No one would go hungry, and everyone would have a “baseline” to start with (maybe food, pocket money, a home of some sort, entertainment). So, THEN what do you do with your life? It has been mentioned on Star Trek many times that service was a calling, it was dangerous, and that it was certainly NOT going to make you “safe” or “wealthy”. Look at all the “redshirts” who died in the first series. They could be pretty comfortable at home - so, money won’t necessarily buy you true adventure. Note everyone graduates Starfleet Academy, and this WAS mentioned.
Obviously, we do not live in this kind of world right now, but we could someday. We definitely won’t get there under communism or even socialism.
Gene Roddenberry was a highly imperfect person, but he still had a hopeful and worthwhile vision.
I think it winds up much more like Judge Dredd. Lots of people mostly bored getting into trouble, and law enforcement goes back to a very “old school” approach a lot more willing to kill people because there’s too damn many of them anyway. Because once you no longer have need for these people with “baseline” providing jobs you run out of need for a lot of people period.
And watch out, this world isn’t as far away as we think. If 3D printers have even half the capabilities people want them to have we take a huge step on this path.