No not really IMO in light of Wallace not expressing a qualifier in his question. What Chris Wallace should have asked was: will you accept the "certified" election results. 

Gore originally accepted the 'uncertified' declared victory, then rescinded the next day which brought about the Florida recount and ultimately the Supreme Court decision.

Now if Trump were to say I will not accept the "certified" election results that could become a problem which would reflect poorly upon him.