After reading your post I’m thinking….why do you have to wait until she crashes and burns. Sounds like you already have a good plan in place, sell the house, stuff in storage, cut your losses. And in the mean time go talk to a few attorneys regarding divorce and custody issues and her drinking issue. Attorney’s can direct you on what to start keeping track of as far as your son goes.
Nothing says you have to move forward it’s just good to know some facts instead of worrying about the things we are unfamiliar with.