Cardale Jones and JT Barrett could all conceivably leave for the NFL after next season, as they should do.
I would take just a little issue with this. IF JT or Cardale drop the the 3rd string, then I don't see that individual leaving. If it is Braxton followed by either JT or Cardale, then I see the back up still getting plenty of work and maybe having enough film to go pro. If Braxton can't be a QB due to the shoulder, then it would really depend on the situation. If JT has to take more time to recover and ends up being the back up to Cardale, I sure would expect him to come back and start in 2016. So, I short, I don't think it is a given that they SHOULD leave after next year.