Well, depends on how long it takes to complete the designs of the beasts, and the instances and raids. Which, at this rate, could take until next year between January and March.
Well I think that the alliance are easier to level than the horde, but the horde have ragefire cavern a level 13-16 instance which you can get pretty decent stuff from.
Gotta love Druids. It's just the fact that when they get to level 10 they can deal a hell of a alot more damage. Not only that but level 30 they have travel form which means they can get from A to B alot quicker. Rogues are alright i suppose.
Yeah, I think it would be worth coming back, especially since the new expantion is coming out. You're going to need as much time to get to level 70 before the expantion comes out, so that you can explore the higher level areas throughout northrend.