I am in the us server HoD which is used to be the one of the most popular servers.
In LA there is even no one talking, can't find any dungeon/fotm group for hours nowadays.
I am wondering if it's just this server? or we all are losing players incredibly fast?
If it's the hoppers that causes the issue, we can't blame them.
The guest function isn't implemented, so ANet could not charge gems for world changing.
Clearly, the ability to server-hop has killed off some server populations (we're just a perfect example of that problem).
But, even with our population being gutted by people going to the server of the month, I have never seen the problems you are experiencing (I must play at a different time than you).
I really don't think it's necessary for ANet to merge servers together, though. I for one, enjoy having the maps not being completely overrun by people farming.
As for your partying problems, I suggest looking for a guild that has people online and who do dungeons/fotm when you're online. It's much easier to coordinate within the guild than going to a map and spamming chat.