Trump is the reality TV version of Hollywood Reagan and he's winning the nomination whether you like it or not.
The only difference is Trump is hilariously transparent about being evil while Reagan, an equally despicable villain, hid it with a sunny disposition. I'd take Trump any day over that piece of garbage.
Reagan was the first nominee of the modern Republican party and Trump will be the last. Decades of the worship of money and xenophobia have coalesced to create the Frankentrump monster.
The difference between Reagan '80 and Trump '16 is that Reagan had some IOUs from 1976 and was considered the "next in line" by many Republicans. He was also the leader of the "movement conservatives" in the GOP. Voters were angry then as well, but Reagan was smoothe and likable in ways Trump could never be.
Reagan was very much an insider, even if he wasn't a part of the Eastern Establishment. Trump is an outsider crashing the party. He's gotten this far because there's a real demand within the GOP for his type of candidate. The GOP is in the pickle they are in because they have encouraged xenophobia, uber-nationalism, and belief that government needs a "businessman" to run things, but this free-trader wasn't what they had in mind. They wanted someone who could schmooze the immigration issue. Sorry, but . . .