The moves, aimed largely at increasing television revenue from the schools’ football programs, are a signal that the landscape of college sports could be reshaped this summer by dramatic realignments that could jeopardize longstanding regional rivalries and raise a range of questions. Among them: Where will the University of Texas and Notre Dame— considered the crown jewels of college sports because of the huge revenue their programs generate — end up? Will the Big 12 Conference (which also includes Texas) survive? As Colorado and Nebraska depart the league, its viability is in doubt. Will a domino effect — driven partly by expansion plans of the Pac-10 and Big Ten — create chaos in any other leagues, such as the Big East?