Depends on how his form and body hold out. He's had injury problems in recent years, though he got through 2015 almost unscathed (having started the season on the injury list). At his age, the end can come very quickly - so it's hard to make definitive predictions.
Assuming he's fit, and playing well, he's still one of our most important players - doubly so in the absence of Dangerfield. He won't, nor should he, be managed out so that youngsters can develop. You do that with lesser players, you don't do it with your best players while they're still performing. That said, I hope they find a way to give him 1-2 games off during the season, as a way of resting his body to ensure we get the best out of him in the remaining games.
Fingers crossed he plays 20 games next year, plus finals (if we get that far).