In the end the Spurs will probably take less in order to keep him from the Lakers. The league will try to keep the Lakers down just like they did with CP3 and when PG wanted to be traded there.
The reason Stern stepped in wasn't because they wanted to keep the Lakers down. That would be incredibly stupid since the Lakers are the leagues glamour franchise.
The league stepped in for 2 reasons.
1. They owned the team and were trying to get top dollar for them in a sale. There was one star player involved in that trade and he would have been leaving which would drive down the value. They overstepped in doing so because they never should have been in that position. But from an "owner trying to make a sale" perspective, it was probably the right move.
2. Mark Cuban and Dan Gilbert cried like teenage girls over it because the trade would have also resulted in the Lakers lowering their luxury tax. For Gilbert, it meant his welfare check would have been less. For Cuban, he didn't want to see the Lakers back on top again.
Also, the league had nothing to do with PG not being traded to the Lakers. In fact, at the time, it looked like Indy had made a stupid trade and they were panned for it.
Then we saw what Oladipo and Sabonis, especially Oladipo, were able to do after getting out from under Westbrooks thumb. Now it look like they knew something no one else really did.
Or at least they can claim that they did now. lol