I think it's too early to tell how much backlash there will be, (and there will always be some). For myself, it depends on how well they balance the new with the familiar. If they take the balance of ALBW and tip it towards adding new areas and change up the old ones significantly, then it will turn out just fine. I really enjoyed ALBW and thought they did a great job of revisiting the ALTTP map and changing things up. It felt familiar and fresh at the same time.
Now BotW felt like they didn't quite use the world to it's fullest potentials. Some areas like the Hera Region, the lost temple, and the springs of knowledge, wisdom, and power felt under utilized. Some of those places had structures that felt like they should have more significance than just a shrine. The lost temple should have been a fleshed out dungeon. Akala citadel also would've been a great dungeon location. There just is a lot more that could be done with the world that I think it would be a shame if they didn't try to flesh out the world a bit more.
That being said, I thought Botw did a really good job of being a world worth exploring and playing around in. This is the first game that Ive put over 200 hours into without it feeling like a chore, (except for the hours korok hunting, I have less than 100 left to find). I think most of my time playing has been spent doing whatever I felt like doing playing with different abilities. I don't necessarily want to always be bumping into a quest or a shrine; the game got a lot more fun and relaxing for me once I found most of the shrines and had the sonar be quiet during my exploration.
Tl;dr as long as they flesh the world out more fully without going overboard and being too content dense. I'll be a happy owl.