After they made Guardians of the fukking Galaxy work, there should be no doubts until they profoundly fukk up. Even Captain Marvel, which I thought was perhaps the least dope one in the franchise crossed a billie. They've been taking B,C and F tier properties and making them work more than any other place has made most A tier shyt work.
So no. A decline shouldn't be predicted. Even if these are all Ant-Man level successes (speaking of which, they made fukking Ant-Man work...), that ain't bad. And they've still got the entire X-Men universe loading in the chamber. AND the sequels to the movies people want. AND Doom. AND the Fantastic Four, which i'm sure a few people laughed at just now. But that team with a proper, not shytty interpretation, and the characters that people think are cool that started with them (Doom, Surfer, Panther, Namor if the rights are all straight, Galactus, etc) could easily be rehabbed into another hit franchise.
TL;DR: I wouldn't bet on it. And if it starts to, they've got so much shyt left untouched they could correct that with ease.
So no. A decline shouldn't be predicted. Even if these are all Ant-Man level successes (speaking of which, they made fukking Ant-Man work...), that ain't bad. And they've still got the entire X-Men universe loading in the chamber. AND the sequels to the movies people want. AND Doom. AND the Fantastic Four, which i'm sure a few people laughed at just now. But that team with a proper, not shytty interpretation, and the characters that people think are cool that started with them (Doom, Surfer, Panther, Namor if the rights are all straight, Galactus, etc) could easily be rehabbed into another hit franchise.
TL;DR: I wouldn't bet on it. And if it starts to, they've got so much shyt left untouched they could correct that with ease.