Now that I think of it, I don't think there should be a sequel to the movie. Don't get me wrong, I (kinda) like the movie, but what if the games get less and less content due to more and more movies being made "for the next generation" to the point where series veterans like myself won't have any interest in them? I know something like that wouldn't (easily) happen, but still. I mean, would you prefer a reboot of Going Commando with half the planets and weapons removed due to more focus on another movie or another continuation for the main series with much more juicy content? Gotta go with the games every time.
To be honest, I'd LOVE a GC/UYA reboot, but if Insomniac decides to make that then I would prefer it with more focus put into it instead of a fragment of content missing due to another movie. And I think the fans would want that too.