They will find a way to agree with it, and say that is how they felt all along.
I think the unifying factor of Trump supporters is not Trump's policies, it is finding and unifying against an enemy they all agree on. First it was Obama, then all of the Republican candidates, then Clinton, and now "leftists" in general.
There does not seem to be any agreement amongst them on what the policies should be, because Trump had no idea how he felt about most things throughout the election. He had very few plans on how to accomplish anything, and seemed to change his mind a lot. He often just said people would be "very happy" and you "believe" him. They did, I guess. So Trump basically does and says whatever he wants now, and they can still rally around winning the election and attacking their common enemies.