I don't know that moving the UGA game later than 7 would be any good. What they have to worry about is flooding even if the hurricane doesn't hit there. With that many people and potentially, people evacuating the area can be a real hazard to have that many people clustered together and all traveling at the same time.
Assuming if the game is cancelled that they'd try to move it to the end of the season maybe unless both teams have the same bye week.
Looking here, it looks like the eye of the hurricane should miss Columbia, but I'm assuming rain could still be a major issue unless it moves further out to see in projected models.
This reminds me of the trainwreck of a game in Columbia two years ago that was rain delayed. UGA warmed up and then it started pouring rain and lightning so it kept being pushed back. UGA had no place to continue to warm up so they're just standing in the tunnel trying to stay warm. Had to do it again in the field eventually but had maybe 1 1/2 hour delay. Disaster.