The problem that others have stated is taking something rational and that makes perfect business sense and then using it as evidence that Marvel will do something that doesn't make business sense.
1. Devoting more promotion and resources to properties that make more money is logical.
2. Outright canceling a property that still makes money doesn't make business sense.
3. Turning mutants into inhumans for the purpose of trying to gain control of popular mutants is asinine because there is no way it can work legally based on the contract with Fox.