I’m really not sure what a visit to court would or could do, TBH.

These are the guys who get to write the rules. That means, they’re allowed to change them, whether someone else likes the changes or not. A ruling that they cannot change the rules could then be used to point out that if they lack that power, then the FCC had no power to put them in in the first place, resulting in no NN laws anyway. That’s speaking logically, anyway.