At this point, I think it's fairly likely that a conservative Republican will make at least a half-hearted run at the presidency, in which their name appears on some ballots and they run a write-in campaign in some other states. Most likely the candidate would win a Nader-like percentage of the vote.
A third party candidacy wouldn't have an even remotely plausible chance of winning 270 electoral votes, but (similar to the goal of the segregationists in 1948 and 1968) it might have a shot at sending the race to the House. E.g. if Trump won the swing states but the third party candidate won some anti-Trump Republican states.
Trump 243
Clinton 217
Indy 78
Holy sh**t, what are you on? The only thing a third-party candidacy would achieve is handing Clinton a landslide the likes of which haven't been seen since Reagan. Definitely not that unholy abomination of a map.
