Man - not to be selfish or revel in Durant's injury - but this probably benefits us in a major way. It significantly shakes up free agency, and it likely disallows Kyrie from teaming up with Durant in NY or Brooklyn, given that KD is very likely to stay in GS now for the foreseeable future. As Kawhi is very unlikely to team up with Kyrie in NY (or even seriously consider NY or Brooklyn at all), this means that trading for AD would allow us to give Kyrie the best opportunity to win with another superstar in tow.
The problem is even after all of his talk about winning, wanting to be the leader of a title team, wanting his banner in the rafters, etc., it's very unclear whether winning is Kyrie's top priority at this point, which is why Brooklyn may be attractive to him.