You can try to add content all you want. It will always be moot as long as you fail to provide engaging moment-to-moment gameplay within said content. This is the difference between current PvP and FATE grind. The former has capacity to keep itself engaging and last a bit. The latter is simply dead after two weeks because there is only so long players will tolerate spamming their aoe combo FATE after FATE after FATE...

This engaging gameplay is where SE fails miserably.