The good thing about KD and Klay is that they are not late in their careers right now, they are still pretty young compared to some of the other big injuries like theirs and that is why there is a chance they can find a way to recover with time, next season will be a season they will mostly stay out with injuries, the season after that they will try to recover and if they do not get injured again and play properly it will be like 60% of they used to be and the season after that will be close to their full potential yet again, these are shooters and not Dunkers so they are still capable of returning fully, the only part I am not so sure about is Durant is a great blocker but his defense may get affected and Klay is one of the best defenders in the league and he will have lateral movement problems so their offense may get back to what it was but their defense may have some damage.