Way back when WvW and your server actually made some sort of impact outside of WvW as well (bonuses on things like gathering, crafting, magic find etc). This kind of gave people at least some motivation to enter the game mode. Could these bonuses come back and additionally provide some other incentives for people to participate?
As it stands right now, WvW is an almost empty game mode now and while we are given the promise of alliances it seems like this is fairly far away and could only be a temporarily jump in population.
If a new player is logging in and about to create their very first character it seems odd to me for them to choose a server name that they may never have any impact on at all.