Here is why you might be wrong, and some people have stopped stuttering. The brain is malleable, you can develop some new pathways that work much better. And when you stop using the old stuttering pathways they diminish. Speech therpay can help with this process. But no not everyone can become 100% fluent, but some can. And some can improve greatly. There is no magic pill yet but some meds might help. Maybe don't put so much pressure on being 100% "cured"