Just an quick idea, please elaborate or amend.
Firstly, reset everyone to a mid point value. New players start at bronze and have no more generated by the game. Threat is then won and lost from player to player.. The more threat a person has, the more threat value you gain from them. Gold needs to be a long grind of consistent high quality play, similar to a long grind in in an MMO [Since the original idea of APB is almost a WoW / GTA hybrid.. You shouldn't be able to just trip over and find yourself being gold, so the gold value threshold needs to be set quite high. A gold player should be a rock star. Someone you idolise... There would be no need for de-threating as you wont have it to begin with.
Segregation of servers needs to be removed to bring in the dynamic experience of [1 prestigious and awesome gold] being the equivalent of 4 unlucky silvers. This would require the server player cap to be raised to 100 again as the original design intended.
Bronze 1-10, Silver 1-10, then only GOLD would be required. Remove green.