If he's barely 40 and being hospitalized for edema, I'd say he's shit outta luck.He's probably got the full triad of heart, kidney and liver disease. Ultimately the body just can't metabolize the alcohol and then, can't metabolize anything from the damage. Once you have problems in any of these organs, they tend to start damaging the others.
From edema to flat out liver failure isn't a long trip. If he's lucky he'll just die of a heart attack first.
Bam Margera is the Lowtax of skateboarding.