Sacked or not, I don't know, lets face it he isnt trying this again whatever happens and if the players want to play for him....
I think he'll be banned by the FA yes, but I dont think it'll be a long ban. If SFC did NOT make him aware of this 72 hour rule they are as much cupable.
If this rule was in place worldwide then its a different story, and who knows, as a result of this it may well be going forward.
I do kind of like the siege mentality angle, its something Fergie spent years on at United after all.