Sure, in the smaller subset of NC games there often is a reversal, but overall, if you include CG rematches and playoff rematches, the story is most of the time it is 2-0.
These are competitive games, if it was 50-50, you might think it about as hard to win two, but it's not 50-50. To say it's tough to beat the same team twice would imply the ratio is less than 50-50, it isn't.
My guess is UGA will play OSU in the playoff. OSU would have a good shot at winning I think, the Dawg secondary looked bad last night, though they usually play pretty well.