With the announcement for Incredibles 3, I already have an alternate story pitch for the movie
The film would have a huge time skip, like 12 years later. The main focus would be Jack-Jack, now 13 years old and is getting the hang of his multiple powers, and despite him being overpowered, he’s having trouble living up to his parents and older siblings.
Meanwhile, the new villain introduced should be a former Super. His name is The Absorber, he started out being a hero at a relatively young age (18 or 19), and has the ability to absorb other powers from Supers, but only for half an hour; around that time Supers got banned leaving him depressed. When the Supers return to the public, he is older but excited at the return to heroism. BUT he suddenly grows paranoid, because he’s worried that a Super or more could mess up and reduce the Supers back into hiding, or worse, cause major damage that destroys their reputation
That’s when the Absorber gets an idea that unknown to him, turns him into the main villain; he plans to absorb every single power from every Super, leaving him to be the only super in the entire world. Of course this could result in leaving the rest of the Supers powerless forever, and that’s where Jack-Jack comes into play and save the day, even the entire world