Not to derail all this star trek talk but I think a TBL sequel would end up being a terrible idea. They would either try to hard to recreate the old one so all we end up with is some half assed copy or they would go completely out to left field with it and it would end up being some shell of a movie that is basically creates new characters using the same names as the old ones.
The best examples I think of are Dumb and Dumber To or Joe Dirt 2. Sometimes it's best to just enjoy what we have.