I doubt that Bush will be impeached. His authorization for telephone/e-mail intercepts stipulated that one of the callers/writers had to be outside the US. So, that dog don't bark. However, Congress might look at his actions and statements that got the US Congress and subsequently US people behind the invasion of Iraq--then, maybe.

I think that he will use the time between now and the end of his term to 'set up' a situation which 'forces' him to sieze power on a permanent basis. Within a year, IMO. Keep yer powder dry.