re: With Eiji Aonuma retiring in 10 years, does Zelda series decline? Other notes.

I don't think it will drop in quality, at least not very much. It will be different though, and who knows, change can be a good thing. I guess we shall see. If there was a significant drop in the quality, though, I would be quite upset.

Oh, and the world being the biggest the Wii U is capable of pretty much can't be true, seeing as how Xenoblade Chronicles X is definitely going to be much, much bigger than Zelda. They're saying it's 5x bigger than the first one which was massive, so yeah.