Honestly, I really don't think Nintendo could pull of an "Animal Crossing" on Zelda. I mean, why not throw in fishing, paying off debts, shopping, Tom Nook, ect. right in there just for the heck of it? Animal Crossing was designed to simulate "life," but Legend of Zelda does not exactly have that same purpose. Legend of Zelda is about adventure and fighting, not paying off debts. I admit it, it would be kind of cool to have a customizable house, but like I said before, Legend of Zelda is not a game about life, it's about adventure.
Besides, I personally, would get bored if Skyward Sword turned into an Animal Crossing game. Animal Crossing is fun and all, but it will get boring in the long run. You always need to have fun while playing a game, which is why I play them. If it was going to be boring in the end, I personally would not even touch or speak of the game ever again. I really want to have lots of fun, even after defeating the final boss. So Nintendo might be ruining the game a bit, if there was a customizable house, but I really wouldn't mind having that kind of feature, since I love decorating... (Girly instincts :3)
(Forgive me for bringing Animal Crossing into this discussion, but I just had to)