You have a picture that has nothing but... 4 pieces of land. pictures exist IN THIS THREAD of the exact same layout of Kil/Easter/Northrend/Pandaria.
You have literally ZERO frame of reference on how big the islands are, how far apart, how "disconnected" they are (IE: Kalimdor isn't "connected" to Eastern Kingdom YET we survived).
Again: Show proof that the 4 islands are smaller than Kalimdor and they aren't easily traversable (IE: Blimps/Boats).
Oh? You can't? Because you don't know? Because BLIZZARD doesn't know?
I thought so.