How would Durant know that the Thunder were going to get George for Oladipo (Ibaka) in a year? That deal was out of nowhere and most people were surprised that OKC was able to make it when it happened.
Really if KD was still on OKC, I'm not even sure if the Pacers would've done that deal as they would clearly be seen as stacking the deck for OKC and no one really wants to be the team that puts another team over the top.
The team you're describing had very little practical chance to form.