Kasich is already firmly on the Huntsman track anyway. This has very little to do with "moderation" and everything to do with him lacking the necessary charisma for throwing out red meat convincingly. 20% in New Hampshire is really a best-case scenario for him.
Yeah but 20% in NH would assure him second place there, making him the establishment "winner."
I'm not sure that it would guarantee him second place. And even if it did, I doubt that it would have much effect. He'd persist, win <10% in a few states, and withdraw a few weeks later, probably.