Personally, if I lived in Canada, I wouldn't want it. That country's yokels are about to be swallowed by a huge cosmopolitan tide that will irrevocably change the nation's character. The US, at this point, would only retard that progress.

Sometimes, the future makes more sense when it's insulated from negative forces. You have to make sure you're pairing with a society that will benefit your own.

In that light, the US would just swamp Canada.