This is simply a question of strategy. The smart thing would be for Rove to step aside "while the investigation is ongoing". This would dovetail nicely with Scotty's bleatings.
While on leave, Rove could be the lightning rod for public anger (while still advising Bush on the sly), and blunt any further probing by the MSM. Just think, two martyrs: Miller and Karl!
So the question: what is our strategy if Karl calls a news conference in the next 24 hours and does this? As I said before, it looks like a pretty shrewd ploy right now.