World Passes have since got extinct. What they used to do is allow a player to Specify which World they wanted to join before SE implemented this functionality regularly.

It does not allow him to transfer his character from one server to another. In order to do that he would have to pay $25 to come to Odin still. It's gonna be hard enough convincing him that after 30 Abyssea would be a good investment let alone a $25 fee just to play when the servers are back up.