A new Flint movie
Doesn't the FLint concept provide a great foundation fo follow-up plots? There could be quite a few series built off of at least the concepts of the FLint films, and not i Austin Powers type slapstick either. You could make them more fun comedy-drams, maybe along the lines of the new Ocean 11 movies.
Either way, there is a lot to build from no matter the direction a movie or TV show could go. Just look at "The man from U.N.C.L.E." you could even go in a direction like that or "The Avengers" as a TV series.