Where are you getting this from? I don't think anyone is looking past Miami and I haven't seen one post on any ND board saying we're going to be in the natty.
We know we have a really good team - nothing wrong with that. Yes, QB is a massive question mark, especially in his first start in a hostile environment, but we also have valid reason to believe we don't need him to win this game. He can lose it, sure, but he doesn't need to light the world on fire to win.
Anyone thinking Miami wins big in this game is delusional. Same for ND. This game is a big boy fight.