After 4 straight 2 win seasons Vegas was a little slow to get behind that team. However, after they beat Iowa State 33k came out the next week. Unfortunately that was against a Kaepernick led UNR team and he went off for 400 and 5 td's.
I remember this time vividly because in the last 15 years that 2 week stretch was the most excited I've been about UNLV football.
#15 Arizona State - Win 23-20 in OT
Iowa State - Win 34-31 in OT
UNR - Up 10-0 5 minutes in to the game! (Blown out after that)
Anyways, Vegas will support a winner. You're right that the opponent does matter but moving into the new stadium the future schedules look great. If UNLV is winning we would set all kinds of attendance records over the next 5 years. If we're still having garbage 2-4 win seasons nobody will care about UNLV football 5 years from now.