>In other words, the first two Star Trek shows (i.e., the shows that Roddenberry exerted direct control over) seemed to have been extremely good at attracting people to the technophilic ideology.

That's fair. Tons of scientists and engineers got into their fields because they were inspired by Star Trek.

>TNG is also a potent advertisement for communist ideology: Roddenberry was at the time interested in communism and insisted that money was absent (or rare and unimportant) inside the Federation and that crime and strife between people had mostly been eliminated.

Yes. It isn't that potent, though, because it depends on a post-scarcity economy of free energy, FTL and magic boxes that make anything out of nothing. It also assumes humans will just "evolve beyond" their basic nature, bigotry, vice and desire for hierarchies of power.

But for communism (or weakly, socialism) to work in the real world it has to deal with scarcity and human desire.