Although he's "stable", thanks to an injection every 3 weeks, he's not going to ever get better. In fact he continues to retreat further and further away from the world and life. Why don't you go to the bowling group, movie night, job placement, etc, I used to ask him (events organized by a local psych facility for their patients, etc). Those people are crazy, he said.
It's a baffling disease. Besides his hallucinations and delusions, the defining feature seems to be that it resists treatment of any kind that would lead to what you and I would call a normal life.