Since this is going to be a console game I think they should take the opportunity to expand the areas even more.
I'd say Pokemon has always been pretty linear, but that's only because it was made as a traditional 2D RPG in mind. When I look at Alola, I especially see this. It seems to me that GF thinks of Pokemon games as grid-based RPGs more than as a 3d space. Something they should definitely change for the next gen. In S/M there are plenty of empty spaces that don't make sense in how the region is laid out. However if you were to make these spaces 2d it would make more sense because you aren't seeing them from every angle. It looks like less space because you see it on a 2d plane, not in a 3d environment.
That being said, let's compare that game to the colleseum games. If GF is going to take inspiration from any 3d Pokemon game, it should be from those games. Yes, they have some issues, but in regards to being a mesh of 3d and Pokemon battles it works well. The world feels like it was made with being 3d space in mind. Areas do have open spaces, but they usually branch out. The only part we didn't get to play was travelling between towns.
That being said, I think it's also important to consider that many of Pokemon's issues aren't because they were bad ideas to begin with. I always say this and I'll say it again; the system Pokemon has in place doesn't need to be completely overhauled, it just needs to be refined. Reworking how you travel through areas is a refinement that is way overdue. Reworking how the Battle system functions is way overdue. They don't need to keep adding new crap to old problems.
I'd much prefer that instead of them creating an entirely new system with their own set of problems, that they just focus on the system they have and make it better. As a console game they should definitely step up their game, no doubt about that, but asking for a Pokemon breathe of the wild version I feel is a bit ridiculous.
I know fans usually like mixing elements from other games into 1 dream game, but how that development process occurs and the final product of what you want will always be different from you get. It's the same as the argument that a Pokemon game should have all 6 regions without thinking how time-tasking it would be. There are other ways to improve the game without a complete extreme overhaul.
So overall, I don't want a breathe of the wild, I want a refined, enjoyable Pokemon game.
Edit: Grammar