One last thing: it took me about 200 hours to finish my class story on my sage. It will eventually (when I do it) take me 200 hours to finish my class story on my assassin or agent, whichever I play first. Assume 20 hours of play a week, and stop with just those two characters, and that's 20 weeks worth of play. 5 months.
The reason I bring this up is because I wonder how much of the burnout/not enough to do issue has to do with the number of people (including myself) playing absolutely ridiculous amounts of time since launch. I think I finished my initial 200 hours on my sage in something around two weeks.
This I think ties in to my instant gratification argument (have to get to 50, have to do/have everything now damnit), and might explain why the so-called "casual" reaction to the game is so different than the so-called majority of mmo players who seem to be in exodus now. As they always are months after the launch of any new game.