It would be way cheaper.
First, you'd cut out millions of insurance company jobs.
And profits.
You'll see all sorts of complaints.
But here's the truth.
From former Michigan governor Jennifer Granholm.
http://www.thedailyshow.com/watch/thu-september-22-2011/exclusive---jennifer-granholm-extended-interview-pt--3
Working conditions, environmental laws, benefits, etc are similar in the US and Canada.
However, Canada has universal health care.
Manufacturers don't have to pay for it.
More cars are manufactured in Ontario than in Detroit.
And health insurance is one reason.
SO, not only would it be cheaper, but US products would be a bit more price competitive around the world.
Interesting how many people seem to think what a bad idea that is.