I'm saying two things. First of all, listen to what McGhee actually said rather than the fluff rags like the Rancid spun around it.
Secondly, I would bet a large sum of money that the scenario you outlined with those players leaving and no new players being brought in does not happen. The transfer fee for Porter alone should cover the pitch repair and the fee for Clarkson, who has a full 12 months to run on his contract, would fund a replacement.
So if you are laying odds on what you are predicting, let me know.