The Amiibo started out as a Super Smash Brothers concept, using the toy-to-life franchise to create an AI that could level from 1 to 50, learning how to battle better as they increased in level.
It has been almost a year since the Amiibo first official wave, and since then the collectibles have been selling well, if any indication of that is the difficulty of finding them.
In the year 2014, Nintendo managed to ship 10.5 million Amiibo, and in 2015 the first half of the year alone has passed that number. Nintendo President Tatsumi Kimishima has noted that regardless of the shopping season, Amiibo appear to be selling well worldwide. (via Gamespot)
With Amiibo selling as well as they have, it’d be hard to picture Nintendo halting support for them anytime soon. They have announced the Amiibo that have sold the most, although its important to note that a lot of the top figurines are ones constantly under production, rather then limited waves such as the Villager or Jigglypuff.