It is 20 months until WW, so we expect it to go like it usually does. By that time, many will quit and/or move on to other servers. At that point we will probably be down to 50 solid members. I hope I am wrong, but realistically, that is how it usually goes. If we are lucky enough to have all three branches survive to the end, then you will see us competing with one another to build our WWs. But we think it will be fun. Then we can move on to a Hero Server together most likely.
I can pretty much guarantee you, though, that you will see Underworld in the end game.