I'd love to see a "making of" or "behind the scenes" Trek movie, start with Gene's early TV writing jobs while he was still on the LAPD, have it end in 1969 when the series gets cancelled. We have all heard or read the stories, how great would it be to see what making the series was actually like.
Think "Man on the Moon", or the Mel Gibson TV movie about the Three Stooges, only better.
As for rebooting TNG, please don't. Let me remember and enjoy the work of the original TNG cast while they were still in their prime, no need for any more reunions.