WhiteEaglePL on 22 November 2014
Should be anything between 30m and 210m. 
It's hard to predict, as we don't even know the first numbers so far. And there most likely will be more amiibo lines other than for Smash. I'm expecting a new line announced for the next big 2015 holiday title or something, soon after all WAVES of Smash amiibo are selling! 
