lol, that place is so insignificant I didn't even remember it until you brought it up. You can't seriously compare that to Dalaran, please. The whole city is magnificent, full with unique NPC's, lore, vendors with unique gear plus unique achievements. It has an AH and portals. Bilgewater Harbor has a few trainers and quest NPC's so you can get to Twilight Highlands. The whole place was designed for the Horde questline to get to Dragonmaw Port. That's it. But I think Blizzard will see this and won't be stupid enough to give you another city and give us nothing.
If they gave you Dalaran and ever updated Northrend, I'd have a problem. If you don't mess with my Dalaran, do as you please. I'm a proud mage who loves the Kirin Tor, I love my city.