It's never easy and always sad when it gets to this point because all the while we only want them to get well and fight for what they have. You are very strong for having come this far. I know how difficult it can be.
You can't go by other ah's...addicts don't work on a schedule of when they're going to go into recovery. I suffered my exah's addiction for 3 - 3 1/2 years in marriage and even after that he didn't go into recovery. You never can tell. Only now did he enter himself into Intensive outpatient rehab and even this is no guarantee for long term recovery.
You have to do what is best for you now and just see where the chips fall later.