I'm willing to give them credit for leaving if their statement is okay. It has to say that they won't ever consider supporting any change that doesn't have the support of the clubs throughout the structure and of fans. If they apologise and say that then I'll say fair enough, people are entitled to make mistakes.
If they make some statement that they have left but still want changes .. bla bla .. UEFA so unfair .. bla bla they can get fucked.
I think the reason they provide for leaving will be vital in deciding whether people see them as reluctant scumbags who saw sense, or devious bastards who feel like they have been forced to abandon their nefarious plans against their will.