Trump is such a vile, loathsome, self-loving egomaniac that I think Hillary or Sanders will rake right over him in the general.
He already has a large chunk of Republican voters disgusted with him that would never come out and vote for him. Hillary or Sanders will easily get their base out. Trump will have deal with Conservatives sitting out once again.
I am one of those who personally regards Trump as a low life. If in a contest between him and a standard hack Democrat, the thought of sitting this one out would cross my mind. It would be one of personal self respect. However, if the opponent was Sanders, then I would happily vote for Trump. The simple reason being that Sanders is a Communist. Sanders is the only one in the race who adheres to a totalitarian ideology. I do not state this in the manner of the loose banter thrown around in these parts. I mean Sanders is a dyed in the wool Bolshevik. Even if the choice in a general, for argument sake, was Sanders against Herself, I would vote for Herself, to prevent a real Communist from ever sitting in the Oval Office.