Waits like these are funny, the devs were scared that a bunch of people would finish the story and then quit but most of us have been here for 5+ years. Not because the content is hard or due to the clever system of delays built into mission storylines, but because we like the game and our friends. They need to keep that in mind when designing content, if it's designed to be fun then people will keep coming back regardless, no arbitrary waiting periods necessary.