The real interesting question is, where is this all going as far as the general election? Will all this right wing crazy see a big hit on the GOP Senate and House control? Will Trumpsim eventually collapse or become a small indigestable rump ideology in the GOP that affects its politics for years to come? If Trump wins the GOP primary and loses to Clinton, then what? Can Trump survive Super-Tuesday? This may be the weirdest election cycle since the Know-Nothing era. Latest polls show Trump gaining. What would a defeated Trump do? Fade away or start some sort of new party or set up think tanks and start looking for candidaes to run for office?
I think that the most interesting question in the upcoming election is what will happen with all the Senate, Congress, Governors and all that. Turn out in Presidential elections is higher because people come out to vote for the President and then end up voting for all the down-ticket candidates as well, generally for the same party that the President their voting for is from. While the question of who'll be the next President has already been answered, the question of what happens with everyone else is still very much up in the air.
The GOP has more Senate seats up for grabs next year than the Dems do and if decent sized swaths of the GOP electorate stay away, either because of a Trump candidacy or because of the lack of a Trump candidacy, the effects of this on GOP seats in the other races could be significant. I think that a Trump candidacy would be far worse for this, since he'd motivate a lot more people to come out and vote against him and thereby, for the most part, against other Republicans, than any of the other milquetoast also-rans who are his competition would.
It would be funny to see a debate between Clinton and Trump, though. If I were her, my main strategy would be to keep my answers brief and cede my time to him since the best thing that could be done to undercut Trump would be to just let him talk as much as possible.