Basically once uA/Avtr announced they were leaving, everyone else immediately came out the woodwork.
We are considering our options now, but this sort of blindsided us. Most of the "clique" guilds went to FA due to some inside "invitations" from that server being extended. Few others sent to SoR, SoS, and other middle tier servers. We got a lot of invites from JQ to join there, we got another invite from WM International to join Kaineng. We never considered it much, but after seeing this explode in the last few days, we're holding votes now.
Such is the way the developers designed the system. Much respect goes out to the guilds who worked so hard to try and organize our small WvW community on IOJ.
Blackgate would love to have you.