Supposedly there are more voters now not registered with a party than ever before. I would believe that they don't register not because the right isn't far enough right or the left isn't far enough left. They probably don't register because they only believe half, or less, than what the two parties say and don't want to be labeled as either.
I can't see much of that group "falling in line" with anyone, or having trump appeal to them and drawing them right. I think that group has no representation in the election now and are struggling like crazy as to who to vote for, given the likely two primary winners. I could also see them not showing up and voter participation being drastically below norms. This is why I am surprised that the primaries are the same race to stupid as always. A little moderation would go a long way in the Nov election.
It can't be long before something changes, ala Tea Party, for this group, but in a moderate movement way.