A couple of things:
1. Terry Wilson is going to sign with Nebraska unless Oklahoma.. As in the Sooners.. Make a late push. Oregon will have more competition at the QB spot going forward.
2. If POB or Wilson compete for the starting roles in 2016, that means Nebraska will have a terrible season in 2015. It would need to be collossal tank job in 2015 to unseat a senior QB with 30+ starts going into 2016. You also have to consider year 2 for Armstrong will be better with Riley and Langsdorf. They will give him the benefit of the doubt even if Nebraska has a ho hum season with only 7 or 8 wins. By that merit, aside from injury, Tommy would need to have a disaster type season to get unseated by a Freshman in 2016.
3. Nebraska plays Oregon, @ Ohio State and @ Wisconsin in 2016. No team in college football wants to trot a Freshman behind center with that schedule.