Set it on DS9.
Include the best of the cast from TNG, VOY, and DS9.
Lots of awesome stuff you could do with that. On a side note, is anyone else disappointed that there's zero Cardassian appearances in the TNG films? That they were series-long anagonists in DS9 but somehow not good enough for a film seems like a huge wasted opportunity.
Well a lot of good this does us now! Where were you in 2001 before they started filming what we got?
But look at your premise. You've got characters and a possible central setting. But where's the story? What's the awesome stuff you want to see? Sure, we say we'd pay to hear Patrick Stewart read the dictionary, but do we want to see that?