People are probably consolidating to more high pop servers. IMHO the game is dying.I've been playing my sith sorcerer(Seelenlos) for the last week on the fatman and haven't seen anyone else log in.
Before that I was mostly playing on Seele on the repub side and would see one or two others log in.
The guilds may not have much activity but the server I think is growing in numbers. Last two nights I had a 30 mins wait to get in and on the imp side there have been several instances of of the station, so maybe 300+ people.