I believe the next step is the FTAA...which is an EXPANDED NAFTA. As for Canada...they'll put up a fight right alongside some Americans.
Speaking of needing to tank thedollar to get American buy in on an "Amero"...the Canadian is suspiciously weak lately...especially considering the rally in commodities. Maybe they weaken the Looney to cause Canadian pain to get easier buy in on the "Amero"?