I speculate AJ will not retire for long. He will come back maybe next year or at the end of this year but this time in the heavyweight division. If that happens I would also like to see Jon Jones move up to heavyweight if he wins the light heavyweight title back.
AJ will probably try some other forms of income because he is getting tired of getting submitted by better wrestlers, the problem is, making money is hard out there so he will probably come back for a couple more fights.
He wil most likely follow Rampage Jackson, making movies after quitting UFC then going back again for a few more fights. But AJ has still potential left in him, maybe just mental roadblocks he needs to overcome to really make a successful career in UFC. He is a fine addition to HW division, but I would rather see him in LHW and try to win their.