I agree a little bit, but I think they will stay on board. I believe Trump can keep his folks happy and appease the moderates. (the Trumpsters like him, it’s personal; like the Obama thing) The toughest sell will be the “real” conservatives, the Cruz folks, social and/or economic conservatives. I believe that these people are sick with grief, rage right now, but that the thought of Clinton in the White House will draw them out of their stupor in the next 1-3 months.
I have a feeling Trump can actually win the election.
If I had to bet, I would bet it will be a tough general election. But it will be one in which Trump is going to have trouble with the conservative ideologues. Not the least reason for that trouble is the fact that the ideologues are not all the same in anything other than insistence on ideological purity.
So far, though, Trump has some real advantages. First, it’s pretty clear that “ideological purity” demands of some of the Repub factional people cost Romney the 2012 election. Do they really want to see that again? Some will. Some will even vote for Clinton in the insane notion that if things get bad enough, their ideal candidate will someday win.
Another Trump advantage is this. This election, I believe, will be different. Hillary Clinton has to deceive a majority of voters 100% of the time. She can’t afford even one palpably false note. Despite years of example, she can’t lie like Bill Clinton and get away with it. She’s just not that good at it.
Trump on the other hand, can make gaffes, make false statements (whether meant the way they came out or not) and get forgiven. In what is a remarkable turnaround from the usual political situation in which Repub performance has to be perfect and the Dems get forgiven everything, there seems to be something of a reversal this time.
I don’t think Hillary is that good at it. That horrible performance of hers with the unemployed miner was a long way from “Bill Clinton quality” dissembling.
Also, the mainstream media, long the lap dogs of the Dem party, has a lot of trouble this time passing up a good story. Ideology is one thing, but ratings are another. Romney’s being a Mormon was just not that interesting; not a ratings grabber. Trump’s utterances are ratings generators. Now, a large segment of the American public has been trained to political correctness as tight as a straitjacket. Dissent from it is nearly prohibited. Our mouths have been sewn so shut that only a stitch or two would be required to shut us up completely. But some unknown number of people never made it to the seamstress’ shop because they weren’t part of the 'dialogue". And some unknown number will finally realize they can pull the stitches out if they only would.
Trump, so far, has successfully (granted, in a limited context) demonstrated that you can actually express what you think without becoming a fatality of political correctness. In doing so, I think he has stirred up more than many, including the Repub ideological purists, realize he has. I think most people have no idea what the First Amendment is, but they know what saying what you think is.
And so, flawed as his dialogue sometimes is (and it really is at times) the flaws are less important to some than his willingness and ability to speak his mind instead of repeating the nauseating and quite phony platitudes we have been taught to pretend are real content. There really is something refreshing about Trump, and it’s not really what he says, it’s that he dares to say it.
“Oh, but that’s racist, that’s patriarchal, that’s anti-feminist, that’s Islamophobic” as ways of shutting peoples’ mouths might have just worn too thin to hold much longer. When it gets so bad that American-made sushi is condemned as “racist” because only a Japanese is entitled to make it, and worse, when acknowledged ISIS terrorists are imported into one’s neighborhood and one is branded “Islamophobic” if one expresses discomfort at it, it might just be one of those times when the tide gets reversed if someone will only tell the truth about it. In saying what a lot of people think but don’t dare say, it isn’t always necessary to hit the eye of the target. Sometimes hitting anywhere on the body will do.
and Hillary will get a job in the prison laundry. 
