That was one afternoon off. Their entier society had fallen apart and we helped them pull it all back together. Also there are still Primalists left behind, we didn’t kill all of them. They are in no shape to leave and go solve other people’s problems.
But like I said, the Kyrian are another story. They have had time to sort things out and should be interested in protecting the Azeroth World Soul which factored into their problems. They Kyrian also have a history with the Void which should make them interested in what we are up to.