developer Twitter chat with Lead Systems Designer Greg "Ghostcrawler" Street and J. Allen Brack? I'm as surprised as you are. When asked why the resplendent (and glowy) Crystalsong Forest is oddly barren of anything to do beyond sightsee (and, of course, the rare quest), we received some interesting info about game performance:
Part of the problem is that it sits beneath Dalaran, which ended up being more of a resource hog than we had anticipated. We didn't want to draw too many more players to that zone. Initially the Crusaders' Coliseum was going to be there, which is why some of the quests send you there. We just worried too much about the performance hit.
So what does this mean to the average WoW-player? That you can enjoy the peace and quiet of Crystalsong Forest for a long time to come, because additions to the zone just aren't on Blizzard's agenda. And it's probably for our own good -- we all know what a lagfest Dalaran can be, don't we? Now close your eyes and just imagine combining that with all of the players that come and go from the Crusader's Coliseum. If your thoughts on this imaginary scenario are anything other than "do not want," well, we'll just have to agree to disagree.