If there is content locked behind them just buy amiibo, scan through package and return to store after content is unlocked. Provided you don't have to scan the figure each time you want to use that content. I wonder how they are going to prevent people from just bringing their 3ds once the New 3DS released to the store and scanning figures.
Pretty sure they could put a foil sticker or something on the bottom to prevent that.
Who is gonna use Wii Fit Trainer?
She's in my top 5.