I recently did a semi quasi "intervention" with my ADH at the request of my codependency therapist. She thought it would be a great idea and just what my ADH needed. Well......It didn't work. He denied the problem, deflected it onto me that I have a spending problem, refused to go to inpatient detox or AA, threw away the numbers i gave him, told me "he will work on it on his own" "he will cut down. I'll see. watch him". He has cut down some but still hides it and is still actively drinking on a regular basis though not to the point of intoxication. However I know its only a matter of time until he does again. So moral of the story is, sometimes interventions can work if the person is truly ready to change, if not don't be surprised if it backfires.
You really cant "change" someones drinking if they don't want to change it for themselves. You can try the intervention if you think it may help. Keep working on you and the things you can change.