Yes.
He brings scoring, rebounding and -- importantly -- leadership and mentorship.
The first two will start to decline. There is no question about that. But that latter will affect the play of Bradley, JJJ, Sully, Melo, potentially Bass, Steemer and Green (I'm thinking of our Fs and Cs), and will pay dividends for years to come.
Also, of course, it depends on the structure of the contract. Is the last year a team option? Doubtful, but if it is, ho-boy, it is worth it.