I think Jonah would say you are stuck on the zero-sum game.    You look at the 60 bill as being taken away from the US,   If we profit by NAFTA it can still be very good for the US.   We still gain the entire Mexican marketplace to offer goods they can make.

There's no proof that American companies would make the same goods for the same price or that American consumers would buy those goods at a higher price. 


And while you mention American dollars going overseas, you need to mention the saved dollars we get to keep by buying less expensive good from foriegn sources.  You slap a tax on goods coming from from Mexico then American consumers will pay in higher prices.

It's not a simple question thats for sure.   

 If NAFTA has been a bad deal, looking at the relative strength of both nations, I would say the United States has suffered less.

https://www.theguardian.com/commentisfree/2014/jan/04/nafta-20-years-mexico-regret  (conservative link)