I don't see how you can say that what ND did was "no different than GT did several times last year." Name 1, let alone several, pwr 5 opponent that we held to 3pts, let alone to less .3 ppd last year.
Now find one, let alone several, where we came close to that while scoring more than 3.1 ppd in the same game.
The only game that I can remember in CPJ era where we beat a pwr5 or BCS AQ team this soundly was Syracuse in 2013. And I don't think we even came close in any other game over the last 7 years.
So, yeah, it's possible that ND's season ends up like ours from 2013. However, I don't see how you can just assume it. You certainly can't say it's like what we've done several times.
I also don't think we have to make ND bad to see them as beatable. We faced good teams in big venues last year. We don't need to be anxious, but we should expect to play a very good team.