Rift had a very similar problem but the fixed it just in time and gave free transfers just before a lot of people were about to quit. They listened to the community.
I am on a 'mid' population server, sat afternoon there were 2 people on Ilum, 15 on fleet, 4 on belsavis. You couldnt find a grp for love nor money.
I am an officer in a great guild that has slowly declined as people hit 50 and realise there is nothing much else to do as cant find groups.
I waited for this game for years and now i am about to quit because playing on an empty server sucks. I have 2 50's with nice gear and lots of credits, I am NOT going to start all over again.
Goodbye SWTOR, hello GW2....
EA - you need an endgame or we will all go the same way.