I don't think the establishment is revolting. There appear to have been attempts to get Kasich out and/or to "marry" Rubio and Christie, but these failed. I think the establishment is more or less floundering around trying to figure out their role ... and it seems painfully obvious they have no role. It's appalling to have a nominee who won't disavow an endorsement from a former KKK grand wizzer (whatever) and quotes Mussolini (and here I thought he was only semi-literate!)
I don't think the donors are gonna give him much money. And, I don't see him spending half a billion of his own, nor to I think he actually has that kind of liquid/cash. It's going to be ugly, and most likely the nastiest election since before the progressive era. He's going to try and label Slick a child rapist and Hillary a traitor. In turn they'll dig up every bit of dirt on the Drumpf family, but their attacks on him will come from surrogates, and I don't the Drumpf's have any surrogates beyond a pit bull lawyer of questionable litigation ethics.
It'll be decided on turnout. The trumpeters are crowing about the numbers voting in gop primaries, but that's not necessarily a good thing. The tea party turns out in primaries, but has proven to be ineffectual in general contests and the most they've delivered is the gridlock that pssing off 70% of us. Will mainstreet republicans turn out to vote for this schmuck? Is there any chance what's left of the Reagan democrats will? I'd think Hillary will have Obama levels of blacks and latinos.
But if the gop battleground senators benefit from the money not give to Drumpf, will that drive gop turnout, and will we leave the top of the ballot empty? Or will Mitt be called upon to ride Rafalca to the call one more time?