You can choose to do whatever you want. It's not what Divorcebusting is about, though, and not the choice the vast majority of the members here would make.
What do you stand for? What are your values? How do you judge your own character? What did you mean when you promised 'for better and for worse'?
How do you want your son to grow up? In a broken family, being shuttled between two parents, or in an intact family where he has access to both his parents all the time?
Are you filing for D to get back at your W? To try to limit the pain you feel? To take control (this seems to be something you come back to in your posts) of the situation?
Note how you went from 'I can't allow this' to 'I could never control her drinking'. But the consequence of what you're saying, is still that you're looking at leaving your 4 year old son with an alcoholic who passes out 5 days of the week. Is that the best for him?
Are you seeing a counselor? Have you gone to any Al-Anon meetings? You have your own homework to do here.
Have you sat down and looked at what she feels is wrong with the relationship and what your part in it is? Do you agree with her? Disagree?
It looks to me like you have so much work to do...
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17