The problem is that the atmosphere of different servers will potentially cause a "combustible chemistry" issue if cross-server content is implemented.

On top of that, the reason why even cross-server content is being discussed, is because so few people are playing the game. Ergo, low server populations. This is a solution people are thinking of in lieu of server merges. Here's the reality: Nothing cross-server should be implemented until after the PS3 launch, because as far as I am aware, there will probably be a significant improvement of player population in each server, which would negate the value of any cross-server content. If the server population does not improve after the PS3 launch, we can seriously discuss things like this.