I've tried to be respectful of the man and the office, but the three defining sins of the Bush Administration--arrogance, incompetence, cynicism--are congenital: they're part of his personality. They're not likely to change. And it is increasingly difficult to imagine yet another two years of slow bleed with a leader so clearly unfit to lead.
The strongest argument against impeachment, of course, is Dick Cheney.
UPDATE: He is not, apparently, hinting at impeachment.