Is there any way to play the game as DPS? Or just end subscription?

[Kosmos992k]

So, yeah, there are much much much more than 2 DPS for each tank or heal. That being, all those DPS need to wait till there's a tank or a heal available for you, quite possibly on a first-come-first-serve basis. So, there's nothing much to be done to help that, short of stimulating people to play more as tank/heal.

maybe Heavensward and the DRK will help with that. Since it's gonna be all the craze

DRK and Astrologian won't alter the reasons why people don't like the responsibility of playing the tank or healer.