You forgot one huge thing: If there's another Supreme Court vacancy, the only kind of nominee that will get through now will be an O'Connor/Kennedy/Souter type. That's the end of a chance to put a conservative majority on the court for maybe 10 years or more - maybe a lot more. The conservatives who didn't vote will blame Bush for the non-conservative nominee, claiming it proves he's not conservative after all, because frankly they're not very bright.
Well, if this issue were SO important, why didn't the GOP campaign on this issue.
It never came up. Never.
So quit blaming the voters because the GOP's campaigns sucked.