Amiibos are not really gambling AFAIKS.
Though at the end of the day Amiibos do look like they're dying
Q1 2016 4.2million === Q1 2017 1.7million
Q2 2016 6.4million === Q2 2017 2.1million
Q3 2016 9.9million === Q3 2017 3.8million
so perhaps they will just fade out of their own accord since people don't seem to be buying them as much