I think that if they don't sign him now, and the Spurs go into next summer not wanting to max him out, someone else will. Then they'll have to scramble to replace him with either a player with less talent or someone with more mileage. He might be at 29 when his deal would expire one of the few players actually worth the maxxed out salary of a final year.
If he wants to sign now, do it. A core of Tim, Manu, and Parker under long term contracts all still in their 20's trumps anyone else's young talent as far as a core goes.

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