What I really need, from any game, is the option to change. Option to change appearence easily, which ACNL has to offer. Also I'd like to move these frickin' stones out of the way. One stone is enough, game c'mon. They're always in my way.
The next game should be more like Happy Home Designer, with outside decoration and easy placement of furniture. I'd like that to get transfered to the villager houses in general.
I want the ability to design the villager's homes in the future ACNL game. So instead of just being the mayor of the town, you could also have a side job doing the villager's homes or working for the Able sisters, so you could play dress up with the villagers. Being able to set up "no houses" zones. We have them in real life, I don't see why they forgot that in this game. I don't want to be able to tell where my villagers go, but I do want the ability to tell them where NOT to go. That would be nice.
I generally just want more. More options. More clothes. More furniture. More to do.