Trump's refusal to say he'll recognize her victory if she wins is a non-issue. It's as stupid as when candidates say they'll endorse the winner in the primary. You can't say that in advance because the next day something could be said or done that would force you to go back on what you said. Imagine if Cruz said yeah I'll support Trump if he wins, and the next day Trump says Cruz is a pedophile.
You make that decision at the end of the race. I think this is overblown, they can make a big deal about it on november 8th based on what he says and what happened then.