Should I just live with it???

Ok, so...my fiancé is such a wonderful man. It's obvious that he loves me very much(and I him), he loves and accepts my daughter as his own, we are expecting out first child together, he is so attentive and takes care of everything. Fully there for us emotionally and financially, everyone says I'm so spoiled bc I am! BUT literally the only thing wrong with him is that he likes to drink beer/liquor too much. He works mon-fri and time the weekend hits he thinks it's ok to get completely drunk every day of it. He'll also have a six pack randomly throughout the week. He's not abusive at all, but is very annoying and stupid acting at those times and will even drink until he vomits. He used to be an every day drinker no matter what, until we got together. I've told him how much I hate it and it's the only thing we ever argue about, but he is just not willing to stop. He says it's his only outlet and indulgence and enjoys and deserves having drinks after working so hard. So advice-should I just let it go and live with it since he is so amazing in every other way, especially since we are getting married and having a baby? Or do I threaten to leave if he won't stop? Help!