This needs to happen already. I hope RC isn't overvaluing Blair too much in these trade talks. I know in the past he wanted a 1st in exchange (from MIA & GSW iirc), and balked at a trade when he couldn't get one. Three observations:
(1) The fact nothing has happened yet may mean the Spurs are waiting to see what happens with Neal, and assessing whether they will need to package any spare parts like Mills or Nando in a trade involving him.
(2) If the Spurs intend to sign Neal regardless, the fact that Bonner + Blair for Ariza hasn't happened yet is proof positive that Bonner is in the Spurs plans next year.
(3) Also if the Spurs intend to sign Neal regardless, the fact that Blair + Mills + Nando for Ariza hasn't happened yet suggest the Spurs aren't ready to give up on Nando.