Interesting conjectures.
Since you raise the issue of Plame's responsibility (and it would seem that the whole thing had to have started either with Plame or Wilson), what about other players in the CIA?
Maybe it's beyond Fitzgerald's brief. But who accepted Plame's suggestion that Wilson should be used by the CIA? Who authorized his junket? I doubt whether Plame had the authority to do more than suggest it. Were these higher ups in the CIA involved in the early planning of this conspiracy? Maybe Tenet himself?
Usually the CIA is insulated from such investigations, so I guess we may never know.
I think that problem is the fact that Amb. Wilson is NOT a CIA employee~!