The Spurs should take care of the Spurs. Unless they are offered a foundational prospect, they are better off letting the player walk than weighing down their roster with expensive mediocre players just so they can say they got something. The player remains under contract. If he refuses to honor the terms of the contract, he will not be paid. Once his contract is over, he can sign a new one wherever he likes under the terms of the NBA CBA. Alternatively, he may negotiate a buyout if both parties can agree to terms.
That the end of his contract fails to align with the offseason in which his preferred destination has $61 million in cap space and two other elite players potentially willing to join him there is not the Spurs’ problem. They have no reason to accommodate his wishes, and his attempts to apply pressure through the media will fail and/or backfire.
What has come out in the news in the past day matches what has been rumored in this decaying Internet forum for several months. If posters here knew in February, then the Spurs organization has known longer. It is unlikely that they have no plan other than to play the chump.