I don't know if group therapy would have done anything for me, but I felt I needed something more intensive than that. I found an addictions psychologist who worked a modified IOP with me individually. I saw him for an hour, twice a week for 6 months.
I get wary when people post here saying their loved one "agreed" to treatment as if it were a bartering chip or the result of some sort of ultimatum.. I sought out treatment when I wanted sobriety more than I ever wanted a drink again. The committment was already there, it was the support that I was lacking. I hope that your husband has the committment to sobriety already down pat.. IOP wont 'get' or 'keep' someone sober (like any other program of treatment) unless that's a place they already decided they ant to be, more than anything else.