It really comes to something when we're daring UEFA to act against us. They know they're fucked if they do and will be ridiculed if they don't. Personally I think they'll just quietly allow it to fade away or at worse remind us of our obligation to observe UEFA's hymn before our matches.
I'd surprised if they dared take it further than that because if they punish us, I reckon they'll have this sanction added to the FFP class action against them to deal with. Notwithstanding this, my reaction to them if they dare punish us will be to Boooooooooooooooooooooooooooooooooooooooooooooooooooooo (Takes a breath) Boooooooooooooooooooooooooooooooooooooooooooooooooooooo the bastards even louder still!