Hard to say. Stuttering can be neurogenic, psychogenic, developmental or some combination of all of them (as far as we know). For now it's just something we might be able to alleviate but not fully cure. The most researched kind of stuttering is developmental as it occurs most often in children and they either grow out of it or not. Stuttering is highly correlated with anxiety issues, science suggests anxiety doesn't really trigger a stutter by itself but might amplify it by a high factor. There are some clinical studies that also link it to high dopamine concentration in some people's brains. Nowadays, it's hard to fix any of those, especially neurogenic (genetic or acquired) stuttering. As you can see we are still far away from even categorizing a stutter, let alone fully fixing it. Some methods work for people, anecdotally, for others there's little that helps them partially get rid of their stutter. Science needs to focus more on the central reasons that cause stuttering. Maybe we'll have big advancements in neurology due to AI and more elaborate studies. No idea how long that would take to find out, though.