I've actually thought about this, since I have nothing even remotely resembling a personal life, and thus I have enough time to think about things such as what the next Trek movie is going to be about.
Way I see it, they've got four options:
a) Make the next movie about DS9. This is problematic, as a lot of people probably don't even remember DS9, and I don't think it has much major appeal. Plus they killed off Avery Brooks, the bastards.
b) Make a Voyager movie. This is overall a bad idea, sicne Voyager was NEVER popular and is generally the least liked of all the Trek shows. You can't expect people to actually want to PAY to see this shit.
c) Throw a shitload of money at the TNG crew to convince them to do one more movie. Bring them all back again, and this time write a really, really kick-ass film. With Q as the main villain!!!
d) Just bite the bullet and try and develop a brand-new crew - one that is exclusive to film. Create new characters, develop a new story. If it works, they'll have injected fresh blood into franchise, and god knows that's sorely needed. If if's a failure, hey, at least you tried something different, and I'm certain that the effort would be tons better than if DS9 or Voyager made it to the big screen.
I think the last two options are the most viable.
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WWFallon - livin' la vida lucha.
"Being a bastard WORKS."
--Spider Jerusalem