Zelda is a classic franchise. Miyamoto and company have already stated that they want to make Zelda Wii something very different. I personally want to see a HUGE Zelda world that is seamless or nearly seamless. The space doesn't have to be wasted, they could create more than one or two towns this time. There could be more people and more side quests. I want to see a Zelda that is more EPIC than a FF game.
As far as controls go, the controls for TP were very good imho. I would like some expounding on them though to make them even better. As for harder enemies, just make the game like the original game. You have to beat it twice to get the full game experience. Zelda Wii could do this easily, as a two-layered disk, like SSBB.
The items "problem" isn't an issue for me. I agree that they could have done more with them outside of the dungeon, but it wasn't a big deal. I would like to see them incorporate motion controls into the items though instead of just pushing a button for item X. The sword controls will be fine as they are, or with a bit of tweaking.
Personally I kinda liked the side-quests of helping citizens in MM, but didn't like the time mechanic of that game. They could make Link a kid again or whatever age they want, and it will be a good game. They could make the game "more mature" (which imho would be a mistake) or keep the same level or even make it more accessible to everyone. It doesn't much matter to me really. I like the franchise and will follow it till it jumps the shark/goes down hill/starts sucking/etc. Then I will move on.