The MB doesn’t say IF this condition disappears YOU can decide to do otherwise.
I don’t think it has to. If someone says “Do X for reason Y” then it’s understood that if reason Y no longer exists, then you don’t have to do X.
It is YOU who decided the aforementioned condition disappeared. The halachic authorities may disagree with your contention.
It’s society in general. Most people who meet with important people today no longer wear hats.
In any event, even if you’re correct (and I don’t think you are) I still think this is a side issue. Considering what I wrote above (about the potential to “break” a child if pushed too far) I think what I wrote stands — if this is the worst thing your kid does, then you’re in good shape.
The Wolf