I would not be against a resource system as long as it was not a nightmare to keep up with. Don't forget that there are casual players out there that only play a few times a week and don't want to spend all there time finding stuff to keep there tribe lands.

As far as the system we have now i would say a person is active if there subscription is paid or not. If a persons subscription is canceled and stays that way for more then 30 days there inactive and removed from the tribe.