ND will almost definitely be in a BCS bowl. Even if they lose to USC, an 11-1 ND team will got as an BCS at large. Especially since there aren't any mid majors like Boise with a shot at a BCS game this year.
But yeah, no way they jump K-State or Oregon if they both win out. Pollsters aren't going to jump them over them just because they're ND. They know that would look bad. People who think that will happen are just as stupid as people who though the pollsters would jump Oklahoma State over LSU to avoid a rematch in the title game. You almost never see change among the top five in the human polls after the halfway point or so of the season other than when a team loses. It looks fishy to change order late in the game if all the teams keep when you've been voting the teams in a certain order several weeks in a row.