I like, scratch that, LOVE the idea in principle, but disagree about the execution.
Scanning an amiibo should add that character into your village. Maybe unlock a single piece of furniture/clothing.
IE. you scan Samus, she moves into your village, give you a Metroid lava lamp.
Otherwise it's a straight-up Animal Crossing game.
(The villager figure should be a special furniture set or something, to make up for not scanning in a character.)
IMO, that, coupled with Miiverse, and better internet connectivity should be enough for them to do something new with it on Wii U.