If he is elected, Mexico should be purged from NAFTA and the walls should be permanent and extreme. Perhaps annexing Obrador-unfriendly areas then build the wall?
He's a socialist. He will remove Mexico from NAFTA before we purge them. It is more important to socialists to have someone to blame than to reap economic gains. It is always easy for socialists to say that the US is responsible for some country's poverty because the US is looting the poor.