I don't see the ticket prices changing much between now and game time. Either Georgia or ND is a huge marquee matchup for us and a national semifinal to boot.
I guess you could wait a few days monitoring the prices to see if there is much movement. I don't think I would risk flying there without tickets already purchased. However, I think if you waited until game day morning you could still get tickets if that is your preference. I just don't think they will be any cheaper than if you bought them a few days before.