Hi jerect,
ahhh this is the eternal question... I have wondered the same thing many many times and i have been both supportive and enabler.
i believe that from a lot of people's view i've been a very very BIG enabler, i've been as far as to keep heroin for him and to give it the next day (well i won't go into the details of the why here as it's not the point but it shows that sometimes you just make choices and, whatever the word to describe your action is, it's just a word and well- too bad- you did it anyway...)
In any case, i agree with the "call": it has to come from him. I've done same as you before: research on rehab and give him the list of numbers. But the actual step to call them and make appointement is a HUGE step and should be from him, most importantly to prove to himself that he is ready.
Take care
Carine