what's going to happen is that Hillary is going to blow Trump out of the water. And the Trumpites are going to be like "No one's ever lost this bad before! That proves it's fraud!"
Hence why they're focusing on outlier polls (Ras, LAT) and ignoring aggregates. Same shit they did in 2012 but whereas republicans (even Hannity!) admitted the polls were right after that election this time I expect Trump and his fiercest supporters to claim fraud.
That being said I think it'll be a pretty small crowd. I don't see Chris Christie, Mike Pence, and others carrying Trump's water anymore once he loses. So it'll be Trump, Don Jr, Hannity, and other burnouts claiming the election was rigged, and the base will believe.
At the end of the day this is a monster republicans created. Not just fringe republicans. Establishment republicans gave them aide and comfort with the obsession over ACORN, NBPP, assaulting the VRA, voter ID fuckery, etc.