I'm all for a lot of dungeons, but not at the expense of a poorly spaced environment. In OB, for example, you couldn't toss a rock without hitting another dungeon door, which didn't feel like exploration at times. I'd like well-designed and well-dispersed dungeons as opposed to finding one around every tree and boulder.
One would think that there would be a good bit of caves tucked away in mountains. Either at the base or hopefully we'll see some mountaintop caves.