Glengarry, there's a lot of success stories out there, also some old threads here, one in particular, I'm trying to find it.
Meanwhile, have a look at this:
http://www.instituteforaddictionstud...20Aviators.pdf
Edit: found it, here
http://www.pprune.org/3028059-post52.html - remarkable story, few go to jail, and it's really not necessary, if the person concerned (possibly even with some help from colleagues) takes early action. Few of these cases go that far, the vast majority involve much less drama, and are successfully resolved at a much earlier stage, quietly, with professional intervention. A lot of aviation is about tried and tested SOP's, and there is one for alcoholism too.
Aviation pioneer and
Aviator Extraordinaire Antoine de Saint-Exupéry once observed this:
A lot has changed since he was flying, yet some things remain the same, alcohol is still there, and the short answer to your question is, yes, it can be fixed, it's been done countless times.