I can't see the Spurs moving him. The emotional connection with Manu is enormous.
But even setting that aside, he is the leader of the second unit and gives that group its identity. The identity stays in place even when Manu is down for a few games at a time with a body tweak.
The same thing is true for Timmy. The past four games have shown that the team identity built around TD stays in place even when he in street clothes for a week.
The current Spurs have enough talent to withstand the brief losses of TD and Manu. They don't have enough talent to replace TP if he should go down (...perish that thought...).