Yeah The Bastion is very empty. Last few Days I been playing there have been less than 5 on Dromund Kaas, around 25 on Imp Fleet and less on odessen and zakuul.
But on Harbinger, there is way over 100 in more than one instance on imp fleet.
Devs need to make something with servers. They can not just wait for people to pay to transfer. Most will just quit playing instead.