You're 90% correct. A percentage — I'd guess about 20% — of the young dingbat Dems won't show up to vote at all if Bernie is not the nominee.
Then Hillary will offer to cancel all student loan debts and these young sheep will all fall in with the rest of the flock. These young millenials may think they’re principled people but dangle some $$$$$ in front of them and their principled stands go out the window. Remember these are leftists. This is the “pay for nothing” crowd. They want free goodies. They feel entitled to a college education without having to pay for it.