"This is never going to work"
That's what they said about invunerability periods and my more-accurate weapon designs. At first.
Oh it's not like I don't trust you in accomplishing making such a game mode work, but I can't wrap my head around the exact way you are projecting your idea in your OP.
I am sure that if it's prototyped and playtested and then tweaked it will be awesome. I have all the confidence in the dev team since all they have made so far is epic and by the looks of it Beta 4 is not only going to be much more GoldenEye-ish, but also much more fun on the gameplay side of thing (not pixelshooting fun but mayhem fun).
Don't project your inability to combat an AuG onto other players, that's rude.
I don't even know what AuG means... But I know that there are people that are thus much skilled that even without a GG they can whipe the floor with skilled players, let alone let them have a GG... So then when the odd turn in their favor, like getting a GG for pwning, it could get extremely outbalanced; the weaker players get weaker and the stronger players get stronger.
A better approach, IMHO, would be that when players are kicking ass, then the rest should have a bit bigger advantage and not the other way around. That makes it a little like poker; the person that wins the first few round get a bigger stack and can play the big stack bully tactic. So now that there are newbies to GES already rage quiting servers (even because of me, and I am not that good) I can imagine a lot of players quiting the GF mode earlyer on and rendering this mode quite boring to newcomers to a round that's already going on for a while...
Well I gues that's why it doesn't have a high chance of succeeding on public servers in it's current draft form...