Big walls of text.
Don't need to open another castle, and this is probably a huge surprise coming from a guild leader who has one of those newer guilds.
Sure it MIGHT mean more chances for NE to have castle...but it means more that NE's ENEMIES also have more chance for it. With alliances having to actually work together it matters more who owns the castle and you can feel there is at least maybe a small penalty to alliance to a big guild. Alliances can't access GD and with new drops there that's something to think about.
Honestly I see more downfalls opening another castle not because of population so much, but because of other things that are going on in the server's woe scene at this moment along with its probable long road future.
All I ask for is consistency in my playtime in WoE.