Besides, Q might've been a difficult character for mainstream audiences to take seriously. "Okay, so there's this goofy magic guy who pops in and snaps his fingers and makes anything happen? What is this, the Great Gazoo? I thought this was a space movie, not I Dream of Jeannie!"
It worked for the TNG pilot, didn't it?
All Good Things would have made for an amazing movie, in my opinion.