I think either way its win for Marvel getting another franchise and/or group of characters for them to use as they see fit back.
Fox might just try to stick it to them though and rush two movies into production to hang on and avoid it altogether though.
I kind of doubt Fox really wants both Daredevil and FF that badly, though. Neither franchise was a major success for them, obviously, but it seems far more likely that FF could become a blockbuster franchise for them
if they do it right this time. Daredevil: less so.
IMHO, Fox will be far more willing to let DD go than FF. Although it would be interesting to see just what the money situation is....Fox could still come out of this win/win, and keep BOTH while just selling off a few major support characters/villains from the FF universe.
Personally, I don't think an FF franchise is going to lose a lot of traction if it gives up some of the major cosmic characters to help Marvel Studios expand their cosmic frontiers --- say, Galactus and his Heralds, Surfer, the Kree and the Skrulls, Uatu, Blastaar and Annihilus. That still leaves an FF franchise with some of the most classic villains in the Marvel Universe --- Doom, Diablo, Dragon Man, the Frightful Four, Impossible Man, Molecule Man, Mole Man, Klaw, Puppet Master, Red Ghost, Agatha Harkness and Salem's Seven, Wizard....