PVP server Imbalances

Ok that was not a thing in vanilla. But even if that’s the case world pvp which is one of the funnest aspects of vanilla pvp will be almost completely gone and most en-definitely cause the rest of the already diminished population to disappear. We have to remember how important server population and server balance is for vanilla. If an already unbalanced side has a free transfer then what is the point of staying if they think it will be different somewhere else? This will be extremely unfair for those left behind when the server transfer is over, and extremely unfair for the opposing faction as well.