I totally get all those feelings. Trust me, you will be SOOO relieved to be out on your own in your own place.
Yes, his situation is sad, but not hopeless. If he has the energy to make up all these grandiose plans about moving and getting another job, he has the energy to drag his butt into a hospital or rehab or AA meeting and say, "Help!!" To people who actually CAN help--if he wants it.
Hang in, as LS said, it's just around the corner!