Well, we've Got Aliens and Predator as well, looking beyond the Hot Toys stuff. ****, If it's Marvel 1/6th I may consider losing the Marvel Legends as well. At that point I would be almost exclusively a Sideshow collector.
I hope it's not movie X-Men. I'd love for some comic Xmen in the 12" scale. Could you imagine Wolverine with real steel clothes. I hope Gambit is first.
Trek is another one that might fit although I don't think the Trek market is that viable these days. No movie or series. The only figure being made are the DST line and I don't hear much rumbling about those. So, I doubt SSC would consider 1/6th Trek as a viable line. I could be wrong though, there are a lot of die hard Trek fans around.