Writing on behalf of a colleague - he is Delta Diamond who currently has a US based account, but has moved and is now a foreign resident.

As someone who regularly travels in business class, does it make sense for him to shift his account out of the US as a foreign based Delta FF? I suppose this eliminates the MQD requirement, but it seems to also result in lower mileage rewards for his travels as opposed to being a US based FF.

Also, given his location, future travel will mainly be on KLM metal.