> "there's a good chance that'll be Donald Trump"

it's actually pretty unlikely. Fivethirtyeight has a bunch of good articles about this, but the simplest piece of information pointing to it: Trump is intensely disliked by about 60% of the voting public. He's got a vocal and enthusiastic following, but once you go outside that bubble, he simply doesn't have room to grow.

I voted for Bush twice, McCain, and Romney, and I'll vote for either Hillary or Bernie (two candidates I can't stand) over Trump, and I'm far from alone.