I think he's done. Poor Nori is old and beaten physically. He can still pull off the good ride now and then, but I think losing the championship to Ben (mostly because his idiot teammate) killed his spirit. He may go, but I fear he'll fade like Kiyonari.
I'd like to go back in time and get Nori, Chili, Edwards, Baylis, Hayden, Spies, and Mladin in their riding prime, put them all on superbikes, and let them have at it at Philip Island or Imola.