"So is this ruling good or bad for Bush?"
It depends on whose name comes out.
that is the risk here, but not just that they will tell the truth and someone at the WH will be implicated - what I fear is that they will lie, and get up there and say "person X in Cheney's office told me". then it becomes a "he said, she said" kind of case, how do you prove it?
Well, let's put on our thinking caps, 'k?
Since nobody supporting Bush or anybody in his WH "leaked" Plame's name (I've expounded at length before on that particular aspect before), then it isn't Bush or his people that should be worried.