That's interesting. It works just fine when I click on it. You wouldn't be trying to figgellie-jinny old Larry now would you? In any case, there's 1798 names on the list. That's not a typo. One thousand, seven hundred and ninety eight declared contenders for President of the United States in 2016. The point is, if one candidate was to drop out (for any reason or cause), that would have an infinitesimal effect on the election as a whole. It never ceases to amaze me how the media can fool the huge majority of people into believing that there are only 2 candidates in presidential elections.
Bottom line - the question is unfounded in reality. Sure, the party losing the candidate may howl and scream about their loss but the election as it is would not be affected. I believe it is called a non-sequitur.
So let me get this straight. There's a question about what would happen if one of the presidential candidates were to drop out? Well, I'm sure the electorate would be able to pick one from this (very long) list:
https://ballotpedia.org/Presidential_candidates,_2016
I didn't count them, but it's a lot!