hotamale-
i'm no expert on drinking.
from what i've seen, at least with my xABF, it appears that he can drink a bottle of vodka for many years and not die. his legs are the first to go and then he can't see very well anymore. once he bled for 10 days from his nose.
i am learning that when people drink a bottle of vodka a day, they can't just come off it without experiencing quite serious withdrawal symptoms, DT (delirium tremors) and even seizures.
if he comes off alcohol, it would be good that he do so under medical supervision so that he can be monitored.
since you asked, i think you did the right thing not getting involved.