Wow, this isn't any reason to move to Mexico. This is something the United States should have done ages ago. People are going to do drugs whether the government likes it or not. It's also only going to be decriminalized, if you get caught with drugs you'll still have them confiscated and get a ticket.
What this will do is encourage people to get help for their addiction. It will also mean that drug addicts won't have a criminal record because of a mistake. I like this idea, and I think that this should have been implemented ages ago. I believe something similar has been implemented for marijuana in Canada.