Given the polling that has shown, for months, that Hillary (and pretty much anyone else) would beat Trump in a general election because he's so polarizing and disliked, I'm not too worried about him winning.
Polls also have indicated for months that it would be Trump versus Clinton in the general. The only drama in the primaries for the past three months has been drummed up by political junkies who had nothing better to do. It's been a pretty dull election cycle since February.