I'm not prepared to say that this is the end of the Spurs dynasty: I mean, we said that, four years ago, when Oklahoma City came back from down 0-2 to beat them 2-4. And then, the next year, they were back in the Finals, and the year after that, they won another championship.
It does, however, seem likely that this is the end of the Tim Duncan era in San Antonio. And that will make me sad, as I am otherwise indifferent to Texas.