I think the ruling on exceeding the 65% rule is fairly clear (not that there was ever any reason for us to worry :)) - relegation, withholding of prize money non participation in Europe (if apprpriate). It is not the case that derry have been found guilty of breaching the 65% rule (as the accounts for this season are not in yet for clubs) instead it is for breach of "licensing requirements" that most mythical of things.
My own take was that the FAI were presumptous in expelling derry and hence the threat to the players to come forward (thus providing the evidence to counter any possible legal challenge).
Basically the licence process has been torn to pieces this season between clubs finding loop holes and FAI fudge/incompetence. Clubs signed up to these rules and there is a responsibility on them to act in accordance with that. Hopefully no club in future puts themselves in a position where the FAI can relegate/expell them. its simple really, stick by the rules you agreed to.