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xD
It's impossible for them to get their characters back, universal still has the Hulk, Sony still has Spiderman and Venom and everything. And this article says that even if Disney buys Fox they may not get the F4 cus they are like shared between Fox and some other thing or something.
Imagine if DC had sold all their characters and people had created franchises out of them, and they tried to get them back people wouldn't want monopoly, even if Marvel gets the X-men they have already built a cinematic universe that doesn't really work with mutants.