SJax is too important to move at this time. He can play the 4 when Pop wants to go small. He's a key in the 2d unit. He's the only player who can both work on the wings and arc and then work down low with his back to the basket. Unlike everyone not named TP or Manu, he can create his own shot.
Yeah, he's way overpaid, but I don't see how the Spurs move him this year.