I don't know that cracking the whip at players with attitude problems is going to make them step up in this instance given that they've just gotten one coach booted. They're likely to try it on again when they inevitably get pissed off that they're being pushed. McGuire isn't a motivational coach. Sounds like he's a disciplinarian. I would guess they've opted for this type of coach to show the players that they've had it easy.
The club has the option to use McGuire to belt them at training for a season, come at them with a tough as nails approach and look for a coach that's going to be more palatable to them when they let him go. The risk is that the players will tank on game day to get rid of him though. And I suspect that is the most likely scenario.
Or option two would be to work out which of the players with talent are likely to be the ringleaders in white anting the coach and make an example by trading them off. But that's if they plan to hold onto McGuire.
I think it comes down to whether head office thinks they can pull the team into line or not. I'd guess eventually they're going to have to piss some if the less co-operative players off. It's just a matter of how soon they reach that conclusion.