When your a dev at blizzard i bet you want to go back to underwater zones and try to get it working, i mean it is something new and a challance to make it work. So for the dev team i am pretty sure they actually would like to go back and make it work.
But as for me i would love to swim from Kalimdor to Eastern Kingdom and from Pandaria to Northend, and for that to happen they need to be connected by the seafloor. (make the world hole)