A few movies based on old tv shows work ("Starsky & Hutch"), a movie based on "The Fresh Prince of Bel-Air" would NEVER work. No what I would like to say to reunion stuff, etc.:
Why not leave things like they are? "The Fresh Prince of Bel-Air" was a great sitcom which was produced from 1990 to 1996. We have 148 eps. we can watch again, again and again. Sure, it would have been cool to see new episodes, but I think it would only work as real tv series.
Now what I would like to see is a brand new sitcom with Will Smith and, now that "The King of Queens" will finish its production this year, Kevin James which showed that they have a great chemistry in "Hitch".