What happens when two alcoholics attempt to divorce one another on grounds of habitual drunkenness?

This happens. An alcoholic wife claims her husband is a habitual drunk, even she supplies the alcohol, and liberally partakes in drinking.

Under traditional fault grounds, if one spouse participated in or encouraged drunkenness, she would be unable to claim it as grounds for divorce. This is much like the idea of condoning or colluding with his behavior. One cannot encourage behavior while claiming to be offended or injured by it.