Oh course it is. Once released they would need to continue their treatment regimen to remain stable. It's staying stable that's the problem not getting stable.
Once stabilized, I read about one third if schizophrenia patients continue their medication.
That ratio can be improved.
These days there is a treatment for schizophrenia in the form of a shot that only has to be taken once a month. That needs to be made widely available. That should make ongoing treatment more feasible.