I have hope though that at least movement speed will be slower, so it will still feel bigger.
For future BGS games, they should definitely aim for a bigger world though, mainly because of all reasons stated before.
There is no perfectly good reason that has been stated for BGS to make their games any bigger. In terms of quality and detail, they make the biggest and best open worlds in the gaming industry.
This is the key statement that defines all games, especially those dealing with large worlds. "It's not the size of the world that matters, but how developers use the size that they are given."