Spurs signed him to a reasonable contract before this year. I think he has two more years on that contract.
My sense is that Danny is getting to be a tough defender. The shooting is off-the-charts right now and certainly has much to do with TP's drive-and-dish moves.
He hasn't shown the ability to get to the rim.
He has certainly worked his butt off to earn a spot in the league. Got cut three times and wouldn't take no for an answer. He has developed a great motor.
If the Spurs were inclined to move him, this off-season would be the time because the Finals have been a personal highlight reel for him.