I tend to agree that OU fans may be feeling pretty uneasy right now. Coach quits. Players leaving. New conference with atleast 3 or 4 super power type programs (Ala, Ga, LSU, Fl) and then rival Tx, Tenn, Auborn, A&M, and several more that are never less than pretty challenging teams for anybody). The Big 12 offered about 5 easy games and maybe 3 challengers and one real toughie. No more conference titles awaiting them unless they play great fb almost every week.
Riley gets out at a good time imo. USC could become royalty in the PAC 12. Only one or two rivals. Southern Cal is USC property with a big name coach for several years.