Had he wanted to transfer, he would have already done it. He was bypassed this year for Leonard, was recruited over with Carr, and Knight for that matter, with a new OC who places value on mobile qbs, which Angeli isn't.
Angeli realizes that he doesn't have a pro future and values the ND degree/experiences. I could see him as a grad transfer when he gets his degree but not before then.
Minchey is the more probable transfer possibility. Unless he really progresses this year and in spring, he is likely stuck as the #4 guy behind Carr, Knight (assuming he comes) and Angeli with little path to playing time.