Well, he did it a week later against the Heat again...so yeah, I can see it happening again.
And the Mavericks are still much, much more experienced than the Thunder. The gap didnt close because the Thunder went out int he second round and Dallas won a title. Another thing to remember is that Durant has never won anything, ever. He didnt win state in HS, didnt win a single NCAA tournament game in college and never been past the second round in the NBA...he has never been to even the smallest of mountain tops. Dirk and company just got back from Everest.
I forsee Durant spending much of his career like Dirk did, a great scorer who doesnt really bother with defense except every now and then. He'll play on great teams that win a lot of games and then lose in the playoffs. One day he'll start playing better defense, learn to close and win a title down the road.
One more thing: Carlisle danced circles around Scott Brooks in that series. While he was drawing up game deciding offensive possessions, Brooks was playing cheerleader, arguing with Westbrook and being ignored by Durant. Every time he made a late game substitution, Carlisle laughed and said "No no, because I'm going to do this...". He danced to his tune and then told his team to "believe" and play hard" in the televised huddles. Why is that going to change?