Even ignoring polling, you now have Trump's campaign recently running attack ads against Haley in New Hampshire. That is something you simply do not do if you don't perceive someone as a threat. I don't know who will ultimately win the New Hampshire GOP primary, but I can say Haley is starting to make Trump's campaign sweat. Christie dropping out, who was the #3 candidate in all the New Hampshire polls, only boosts Haley.
Bury your head in the sand if you want, just don't act too surprised less than two weeks from now (New Hampshire primary is January 23) if Trump didn't win.
NH is not at all representative of thr broader GOP primary electorate. This strategy is one that will embarass Trump until NV but in the real fight she would get maybe 3 more delegates in NH, and assuming the IA polls are anywhere near accurate Trump will be leaving two very bad states for him (that are isolated) and then he’ll be going to NV where Birbrain will get 0 delegates because she didn’t bother signing up. Shell make a run at it in SC and then it’s off to the south where she has no support and more of the primaries are closed. Trump may lose NH but right now it’s comfortable. Id say if he takes NH and IA, forget about it. Everyone will have to drop out