Hello there strangers, this is my first post here.
I've done some basic research tallying up the numbers per realm. sourced 'mostly' from here. http://www.gw2guilds.org/
EDIT: After looking at the guilds on this site, the players registered to this website and the balance of posts between the EU and American player base. I feel confident that this server will stand more than a fair chance in WvW. While the population will still likely be lower than a selected few of the very highest populated servers It should not make WvW impossible due to player limits being able to enter WvW at one time. A player base beyond a certain point will not be able to take advantage of it and will find that they are having to queue a lot during the day, with the only exception in the young hours of night time gaming.
The best thing we can do for the server is to learn and educate it about WvW's seige and supply uses and take pride in being part of - from what I've seen, a very fast growing, motivated community on Piken Square.
Server Balance (original post)
Now roughly, according to http://www.gw2guilds.org, some of the main server populations, without taking random unlisted players into account is going to look like the following:
1150players - Whiteside ridge
1004players - Seafarer's rest
1195players - Ring of Fire
2625players - Desolation
6352players - Blacktide (one guild here has 6000 players for some reason, could be a lie)
1514players - Gandara
60players - Piken Square.
Don't panic - I know how this looks - so I looked up all the european RP guilds myself and tried to get a more accurate number, counting all the members of all the RP guilds I could find to get a better picture using 'this' website, and it's main Guild Recruitment list (below)
351players - Piken Square (self added from what I could find at the time of this post from the main Guild listings for piken square)
Edit: The above is part of my original older questioning.
Since my initial observation here and looking at the player base beyond just its forming guilds, I would say there will likely be more than enough players to put up an adequate WvW fight from the RP community alone . This is without taking players that aren't on this website into account which will boost the numbers even more.
Just to clarify there are now over 3000 members on this site. Even though Piken Square's Guild Form is smaller than the Tarnished Coast. Piken Square's server forum seems as active as the Tarnished Coast's. It's hard to say where the region split is but Piken Square seems more than ready for a fight and a half.