Prior to becoming a subject of an experiment, Charlie works in a factory and he is often the victim of teasing and bullying. Other workers take joy in setting Charlie up. After Charlie loses his intelligence, those very workers began to defend Charlie. This is probably the only positive change in the story. If Charlie were to stay with the factory, he probably would have a better experience working there.
Another possibility is that the experiment may have damaged Charlie such that his life would be shortened. After all, the mouse Algernon died following his loss of intelligence.
In any case, Charlie has been abandoned by the researchers and has lost the abilities he cherished. He has lost his teacher. He is significantly worse off than prior to the experiment and his remaining life would probably reflect these facts.