I know I speak for a lot of KP fans when I say that we'd love a 5th season of Kim Possible with the original voice actors. A lot of the original voice actors have made it clear they'd come back for more episodes. 

There was a petition for this years ago that I had signed, and it had the amount of signatures Disney asked for, but season 5 was later scrapped for unknown reasons. 

Kim Possible was ahead of its time, and I believe the new generation would very much enjoy the cartoon. Nothing against the live action movie, but it's definitely not gonna have the same charm as the animated show.