"Worst case scenario"? Please clarify how you would define this.
From *my* vantage point, the "worst case scenario" is you stay with your wife, she continues to drink and be the primary caregiver of the children, and some disaster results, due to drinking, causing the children to be killed or permanently disabled.
I'm getting the feeling that from *your* vantage point, the "worst case scenario" would be that you divorce.
Hint: if you truly accepted the gravity of the situation, you would have taken the children and left, and filed for custody already. I'm getting the feeling you're still with your wife out of some bizarre hero complex.