The clubs don't have the control. UEFA does. You can play your card right and make UEFA rethink some things. Or you can overplay your card, and suffer the consequences. If these clubs are banned from competitions that are under FIFA/UEFA jurisdiction, they are in big trouble.
They won't ban them. If they do, I doubt the big clubs will care. They'll just join the Super League and make a lot of money. UEFA and FIFA need those big teams more than the big teams need UEFA and FIFA. It's why UEFA and FIFA are panicking at the moment. They know damn well that the big clubs can survive without them.