No doubt this has been discussed before (possibly ad nauseam), but at what point do we recognise that a change in meaning has taken place? If I think about my own Southern English usage, I would say I usually use moot to mean open to debate but as a theoretical point rather than a practical one. If Americans use it differently that's up to them, but it's worth knowing that the difference exists to avoid misunderstandings.

Bingley

Bingley