That would be cool if instead of having random enemies just chasing around (like those anoying bird things in
TP) they would just get rid of all the enemies completely and have some small establishments with people in it that can give you side quests and stuff.
For me, the best open world so far is the Great Sea in
TWW. It is probably the hugest and there are so many islands to visit and so many things to do in it. There also wasn't a bunch of enemies coming after you constantly. Sometimes you run into a pack of sharks, but once you kill them all, you usually won't see any other enemies for a while unless you go to certain places.