Very good point. Okay, let's say the JW's are right. The 144,000 are ruling in heaven. Along comes the new world. Then the thousand year reign. Okay, after the thousand year reign when everybody becomes perfect, what exactly are they going to rule? If all of the subjects are perfect, what will there be for them to do? Perfect subjects in perfect conditions don't need a ruler. You only need a ruler to help correct imperfect people that are under imperfect conditions.
Also, why do there have to be so many rulers? God can read everybodies thoughts all at once. He can do anything he sets his mind to, so why does he need so many helping hands? The WT uses the explanation that they can understand our problems because they can relate to us. Wait, I thought God could understand our needs better than we could? Also, what problems? Aren't we all going to be perfect people in a perfect world? What problems would they have to relate to?