Let's see, Plame was common knowledge with Washington reporters and they have to prove that Rove knew that she was an undercover agent, not that she simply worked for the CIA in order for there to have been a crime.
Not likely to get very far when it comes down to it.
That's not Rove's problem, if he has one. The problem could be perjury. Hopefully not.
It also has to be proven that there was malicious intent to do harm for it to rise to a criminal act. Not a chance!!