If Vick either makes the practice squad or NFL Europe, he can spend two years there then battle Cleo Lemon for the backup spot once Harrington's two year deal is up.
By then he will either have proved his worth ( redeemed himself and can remain a Dolphin) or at least improved his value to fetch a draft pick via trade.
I think that is exactly what will happen. I also think they will keep the kid from Colorado State. Mueller likes to collect QBs ,they make the squad here or are traded somewhere else either way it helps the Dolphins.