Extraction Shooter, latest fad genre. Bet on it.
nah, it would be easier and better to just give Fortnite a mode like that.
they already have extraction shooter elements in Fortnite with their story based challenges each season. so you already have the [drop in > do mission > try to survive till mission is complete] gameplay loop in there.
all they gotta do is expand that with permanent loot, progression etc. and make it a separate mode, like Modern Warfare 2 did.
it would also be too late I think, and I also think they know that, as multiple high profile games im the genre are already deep in development.