I was pretty dead-set against no-flying in WoD.
But Bashiok lays out a compelling case and I agree with what he's saying. Flying is neat and fun and a nice way to cut out the garbage when you want to just herb or mine or do archaeology...but it also makes the game you play at max level not the same wow po game you play before max level.
So, assuming they find a way to make it possible to gather materials and do archaeology without flying, I see no harm (and many benefits) from removing it from the WoD portions for some time, or even all time.