Wait until more is known about Zelda Wii until you claim the franchise is stagnant and will wither and die slowly. Nintendo reinvent their major franchises to make them innovative and relevant.
I'd like this more if Miyamoto and Aonuma hadn't already said they want to change the franchise because they feel it went as far as it could under the OOT style template. They already know things need changing, as much as I like the intent of your thread, the series producer/director are very much ahead of you.
EDIT- On the subjet of overworlds in Zelda, I agree that TP's felt empty. The sense of scale and the design was great, but nothing much happened in it. And for all of Beadle's shop boats in Wind Waker, most of that was empty blue ocean.







