While I don't think Fitzgerald is anything like Ronnie Earle, he is a Democrat and it's possible that he has his pressure points.
The Dims view Rove in exactly the same way a maddened bull, stuck by the swords and lances of the matador, views its tormentor. If the national Dims have any leverage over Fitzgerald at all, we can be sure they will be exercising it to the full to get an indictment of some sort issued.
I have been afraid of a malicious, politically motivated prosecution for a long time. It's pretty clear the original matter is a non-starter legally, because the law related to the release of her name quite simply doesn't apply to her case. So, in my opinion, an honest prosecutor would have dropped this case a long time ago.
Even if, somewhere down the road, Rove, Libby, or whoever Fitzgerald targets may be acquitted, the damage to the Bush presidency of an indictment will be enormous.