Two come to mind:
(1) Everyone Stares II
You know everyone wants to see this. The movie starts with the recording of the Synchronicity album, the band falling apart, and the disintegration during the tour. You then see the rise of Sting's solo career. Meanwhile you see Andy and Stewart start to begin their life after the Police as they start to realize that maybe the Police will not happen again. Hopes seem to be dashed after the failed attempt to record the Greatest Hits album (facilitated by Stewart's injury), which results in only one new track. Not sure how the Amnesty International shows fit in. Anyway, you then see how Stewart and Andy both seem to get on track with their post-Police careers, both puttin out great stuff and doing interesting things. Meanwhile, Sting seems to dip. Mercury Rising seems to put Sting into the adult listening category and then his lute album, though well received in classical circles, seems like a step in the wrong direction for Sting's career. Andy and Stewart are ready for closure of the Police by doing One Train Later and Everyone Stares, maybe accepting that the Hall of Fame show was it.
And then the call from Sting. The Grammys. The press conference. The successful tour (with some mention of the tinkering of the songs). Stewart's FLAG. And then the tour ends. You see all three are really glad they were able to put the past aside and do this tour for there fans. And the movie ends with Sting saying something to the camera which is very opposite of how Everyone Stares ends. Sting actual thanks Andy and Stewart for making the Police happen.
Of course, this movie would have TONS of derangements and a killer commentary track on the DVD with all three of them.
(2) Wild Thing, the Movie
I think everyone would want to see this movie made almost as much as (1). Think of the passion Stewart would have in making this one. I'm sure it would be AMAZING.
Of course, neither of these films will ever be made