If W & co didn't get hit in '06 ('06 results are not at all a good thing imho), '08 is/was looming as a much bigger problem. The Republicans aren't finished with being given negative feedback. They just got some prematurely.
I spent a year in Vietnam, and the treasonous bastards known as the American public turned that year into a waste. And now they've done that to my son, my nieces, and my nephews. Move on? You're awfully glib in saying that.
Actually, this is a very good point. A Republican loss sometime was inevitable. It certainly would have been nicer, now, if it hadn't happened now but if it hadn't happened now 2008 could have been an even worse disaster.