In my opinion, Marvel is playing hardball with Fox. They are now under Disney and their pockets are full of cash now, unlike when they were fending off backruptcy and sold character rights off to create capital.
The original two movies didn't create a sizable new long-term audience for Fox. Shoot, the only real, separate loyal audience for both of those films belongs to Jessica Alba and her fanbase. This latest movie cannot even claim superstar appeal in that same regard.
Marvel understands the only true demand for the FF characters comes from the comic's fanbase. The title is a mid-range seller. It should be noted that Marvel isn't dropping other less popular circulating titles from its inventory.
So, what's Marvel strategy? Simple. Erase FF for now. The company started the FF purge last year. Even issue covers celebrating Marvel's 75th anniversary omitted the group (see below). I think their intentions are to not feed anything into Fox's passive marketing and merchandising of the FF. Make the FF movie licensing as unprofitable as possible. If successful, Fox will attempt to sell its license to the highest bidder, which of course would be Marvel and Disney.
Also note this would not be the first time in recent years that Marvel has temporarily halted production of the FF title. I believe this suspension of the title will be temporary too until Fox comes to its senses (keeping my fingers crossed!) I would not be the least surprised with the title's rebirth sometime in the future.
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