There's should be a Fantastic Four reboot within an Avengers movie.
Think of it
A serious Reed Richard debates the carefree Tony Stark over how to scientifically solve a conflict (and solve thier own personality conflict). The Hulk meets The Thing (and steps on his foot, whatever) and it's "Hulk Smash" vs "It's Clobberin' Time". Eventually, the two teams join forces to tackle a great foe(s)
If Marvel gets FF back, this would give them a leg up from "the hole" the FF movies got stuck in.
Think of it
A serious Reed Richard debates the carefree Tony Stark over how to scientifically solve a conflict (and solve thier own personality conflict). The Hulk meets The Thing (and steps on his foot, whatever) and it's "Hulk Smash" vs "It's Clobberin' Time". Eventually, the two teams join forces to tackle a great foe(s)
If Marvel gets FF back, this would give them a leg up from "the hole" the FF movies got stuck in.