I would agree except that Republicans might go back to governing like Republicans if there's a Democrat in the White House whereas they will continue playing pork politics as long as one of their own gets the credit.
Bush has grown government astronomically and the rank-and-file have gone along with it because they don't want to be seen as disloyal. With McCain as president, there will be more Republicans going along with things they disagree with for fear of not getting love from the Republican president.
With a Democrat president, they hopefully would grow a backbone and say "no" to federal largesse. That doesn't mean I want to see a Democrat president. I'd much rather see a Republican who could hold the line on spending and push through conservative positions. McCain's not going to do that.
George Allen... that's who I'm supporting!
McCain will NEVER be president because he will NEVER get the republican nomination, period.
So everyone stop worrying.