i have a brother that is totally self-sufficient (financially & medically) who drinks at least 12 beers a day, is constantly depressed. he recently lost his license and really has no social life outside of myself and when my mother visits.
as a family, we've talked to him about this dozens of times, even as a group. nothing has helped. he will drink no matter what.
with all that out, IMHO it takes a tragedy to really change someone's behavior, a MAJOR disruption that causes that person's thinking patters to really change. for me it was losing my home, my fiance, and the trust and respect of everyone i know.
who knows what it'll take for your brother. just pray for him if you're into that kinda thing.