After next year you guys have Cox, Manning (who I bet transfers) and that huge looking Jamarcus Russell Kid who probably ends up playing DE for you guys. Hansen would probably be 2nd string behind Cox. Cox can't throw to save his life so maybe Hansen could beat him out who knows.
After next year BYU will have Mangum and Hosick. Hansen would most likely be 3rd string. To me starting in 2016 Hansen has a better shot at QB at the U. If he chooses the Y it will be for the same reason as Langi, he would just rather be at BYU than Utah.