I like the idea of it, it's one of these changes that is just screaming for RPers to take advantage of. I can just picture it, Asura guilds specialising in building Golems to take down forts, Char Warbands creating large siege weapons and Norns charging into the front lines. Everything is there to build a great epic experience for RPers, they just need to get on with it and start building.
The other possibilities, can't say for sure. The comments are focused purely on WvW to the point where I have no idea what effects it could or could not have. I suppose it's just going to be more like Gw1 where, you have EU1, EU2, EU3 for the big cities so you could avoid any lag or spam which is great because it means that there is more of a chance of people meeting one another.
Server pride and all that? Eh. It's Guild Wars, not Server Wars.