I think it's a way too early to turn a simple slump into evidence that Jeter is done. If he's hitting .276 in July, then let's start with this stuff, but until then it's just a slump, and one that could be coming to an end.
Let's look at how his season has gone so far: Jeter hit a very respectable .321/.354/.491 over the first 24 games of the season. Then, over the next 16 games he hit .169/.234/.211. But over his last four games he's hitting .368/.400/.474 with 2 doubles and 4 RBI, and a more important sign that things are turning for Jeet is that he's start to hit more balls to right field.
Also, his BABIP, which currently sits a .302, is 56 points below his career mark, and that should go up at least a little as the season goes on.
So, is a rough 16-game stretch really worth all this speculation?
I don't think so.