Looks like Nintendo has plans for NFC cards and smaller Amiibo which would be more cost effective for consumers for titles with a ton of characters ie: Pokemon and Animal Crossing.
Source: Q & A here http://www.nintendo....30qa/index.html
Now that we also have decided to make high-quality figures ourselves, we keep making more characters that we think would please our fans. With quality workmanship and attention to even the tiniest of details, amiibo have their own distinct appeal just as a figure. In addition, unique functionality has been installed in amiibo that can be used in games. amiibo can take forms other than figures, too. I just talked about cards (“Nintendo e-Reader”), and the amiibo product range will also include cards in the future. For example, when amiibo become cards, we can create a game which can be played only by passing several cards over the NFC reader/writer, and the results will be stored in the amiibo card. I cannot discuss any of the details today, but amiibo has the potential to propose new ways to play card games.
We will also launch smaller and even more affordable amiibo figures in the future, so we hope that with this variety of price points, consumers will be able to enjoy a number of amiibo.
By using amiibo in different forms, we are internally discussing the possibility of using amiibo with, for example, an “Animal Crossing” game and other games in some unique ways. I hope you look forward to our future announcements. We plan to use amiibo to create new ways to play. Since the already-released “Mario Kart 8” is also compatible with amiibo, you can see what unique features can be realized.