That's exactly part of the problem. The PvP content in this game is severely lacking. That's why people are cancelling. They don't want to grind 3 Warzones all day every day for the chance to get something shiny out of their Champion Bags in order to stay competitive.
The PvP in this game sucks and there's barely any PvE content. As it stands, endgame in SWTOR is boring as hell. No wonder why we never saw any of it in testing.