I think it needs to mix up the formula quite a bit. Introduce new mechanics, new things. Hell, throw in roguelike elements if need to, people love that stuff. Maybe even let people customize their job build with new skills and spells and passives
Make it an area that starts you at level 1 too, so people can level 1-100 with it. That'll garuntee it'll stay populated at least.
As it stands now I know I'll probably never touch it if it stays to the formula. Jobs just don't feel fun enough to take into a deep dungeon because all of them are resource spenders that burst every 2mins.