If the "intereference" is coming from a legal source and their equipment is within specs it can still cause intereference to many things close by. If that is the case there is nothing the AMA, FCC or an army of lawyers can do about it. Commercial radio towers will always have some harmonic emissions and they are allowed a specified amount even if it "interferes" with other systems close by.

Basically RC users, even those on 2.4Ghz, have few rights and can be trampled by other users of the same frequencies.
I was watching US congressional debate the other day on opening up the 2.4Ghz bandwidth for licensed high power WIFI!!!!
If that happens 2.4Ghz stomping will be far worse than FM ever was.