Jones likely isn't going to let McCarthy walk. He's not very reactive and that Dallas team, while it hasn't played well, has continued to fight w/ Jones publically complementing him for not allowing them to give in. If his handling of Jason Garrett is any glimpse into what he's likely to do, McCarthy is getting resigned.
Would he be a candidate? Absolutely...the familiarit for Loomis is there and he fits the "experienced" criteria that Loomis values.