You might also want to consider the complications that would ensue if you are married, living in a foreign country together, and decide you can no longer live with the madness. You would be all stressed out over the fact that you brought him across the country, where he probably doesn't have any support system, not to mention the complications of trying to divorce in a foreign country (there are a couple of people around here who have had those international complications--and they aren't pretty).
Think about this possibility--you go by yourself, he stays here, and you see how the situation looks when you get back. My guess is that you will not want to sign on for a permanent legal connection if he is still drinking at that point. Much better than having to extricate yourself from a marriage.