It was a fluke injury, it came at the absolute worst time, but the fact of the matter is that a nearly 35-year-old superstar will eventually come back down to earth. Kobe has had knee issues, hand issues, even face issues over his NBA career, but this will be the worst injury he's ever faced and it comes when his body is chronologically in decline.
Was it the extra minutes he was playing? The intensity with which he was trying to save the Lakers' season? Who knows. But he's down for a while, and he may never be the same.