When they discharge him, they will recommend places for him to go that are local and affordable. At that point, he's going to have to make the call.
I found that when my AH was given the opportunity to go to sober living or rehab, he had lots of reasons not to, and not all of them were because of a need to use. He was ashamed he was in this position, that it would cost his family so much money, and afraid of what would happen to his friendships and relationships if he took the recovery time. It's a huge undertaking to ask of someone who is new in recovery, to embrace all of the unknowns and engage in real self-care. What made the difference for my AH is knowing that he had our emotional and financial support ONLY if he chose recovery, and otherwise he was on his own, homeless, penniless, friendless what have you.