I'll believe ND is in a conference when I see it. To many powerful alums value football independence like football relevance is some sort of precious metal. Unless ND gets an extremely progressive AD or their playoff access is limited ND will enjoy the status quo and tout football independence as the greatest thing since sliced bread.
In the playoff era ND will have a distinct advantage because they control 100% of their schedule, where as teams in conferences have only non-conference games they can control, while the rest are pre-determined. It will be interesting when the playoff scenario is finalized how ND is treated and if it forces them to join a conference for better access to the playoffs.