I'd like to be able to save all of my letters, or at least a lot more of them.
I'd like to be able to group more items together in my pockets, not just fruit. (i.e., shells, furniture, clothing, fish, etc.)
I'd like to have larger pockets in general, even if they were an upgrade paid for with bells.
I'd like for tools/equipment to go in a special toolbox that doesn't use up pocket space.
I'd like to be able to request the stores in town to stock certain types of items. There's so much randomness and such a limited daily inventory that it can take months to collect all of the pieces for a single set - let alone the set I actually want! I'm liable to lose interest in the game before that happens. I'd like to be able to say, "Hey Timmy, I'm really interested in the minimalist style. Can you stock more items like that?" That would be fun!
I'd like the requirements for some of the badges to be reduced. I've had my New 3DS for over a year and I don't even understand what StreetPass is - but I have to connect with people 1,000 times on it to get a gold badge? That seems extremely unrealistic. Or pull 5,000 weeds? How am I supposed to do that when I've got the Beautiful Town Ordinance enacted? Even without the ordinance, you get 2 weeds a day. It spoils some of the fun in the game.
I'd like to be able to visit towns more easily. I don't have a lot of friends who have a 3DS or play New Leaf. I think it would be cool if Animal Crossing made it easier to connect with other players, but I'd also like to see some type of "public villages" that people could visit. The villages wouldn't belong to any real players, but could be visited by anyone at any time just to spend time and explore. Then anyone could travel out of their village even if they don't have friends who are playing the game.
That's not asking too much, is it?