I think that they can work if the alcoholic is ready to accept and work at sobriety, but millions of people get sober every day without interventions. It sounds like you have a lot of concerns regarding his drinking and are focusing a lot on his alcoholism. I know it can be hard not to when its staring you in the face every day. It might be helpful for you to attend an Alanon meeting. Alanon (if you work it) can give you the tools to deal with life whether your husband is drinking or not. Even if you stage a successful intervention, there will still be ongoing issues with his recovery, and Alanon can help you deal with those things as well.
SR is also a great resource. The stickies at the top of the forum are a wonderful way to educate yourself about alcoholism and the members share a wealth of experience.
Thanks for posting and best wishes.