Ruin Explorer
Legend
That's my point though - dozens of licenced games, and only these three have survived and honestly no Star Trek game has ever done that hot - they've been at best decent success. And I say that as a big Trek fan, I've consistently by surprised by them not doing amazing given the huge RPG player/Trek fan crossover. I think part of it is none of the Trek ones really having a system that's quite ideal for Trek (which is also why the fanbase remains divided - people think the other systems are crap at something that's important about Trek to them).Star Trek
Star Wars
Alien
All three of which are on their 2nd or later license, all three have significant player bases. Trek's player base is strongly divided... but it's divided by system used. FASA, LUG, Decipher, Prime Direcitive 1e... all having player bases unhappy with STA (Star Trek Adventures), but STA has a strong fanbase.
Also worth noting: all three have thriving fan literature, official expanded universe presence, and computer/console games. Alien is, to be honest, the weakest ecosystem of the three.
I could easily see doing a 30's/40's/50's pulp sci-fi with Daggerheart... but only two big names in that come to mind: Flash Gordon, Buck Rogers. Lots of one-off movies, tho'.
Also I'm going to be real but I don't think any measurable number of people are playing the Trek versions which aren't STA and maybe Decipher. LUG went out of business in 2000. FASA stopped publishing their Trek RPG in 1989. Come on man. We can't pretend people are playing these in measurable numbers - I'm not saying no-one is playing them, but it's not many people.