Tony is in the prime of his career.. Manu most certainly is not. The wheeling and dealing talks with Tony Parker started very early in his career, and only stop when the Spurs win a le.
The Spurs are one or two seasons away from needing a complete rebuilding. Im still torn as to whether or not it's in the Spurs best interest to try to include Tony in their future.
PG's can play well in to their 30's, but tony's game is predicated on his speed and quickness. With his past injuries, i don't think he can sustain high level speed/quickness into his 30's. Rebuilding, or not, a team needs leadership and Tony has shown he has that quality. My heart wants to see Tony retire with the Spurs, but any team with salary cap space or big spending ability will most certainly offer him more than the Spurs can...both in dollars and in short term success.