http://www.polygon.com/2017/4/27/15451060/fire-emblem-heroes-sales-super-mario-run-download
This is pretty surprising. Even though Mario Run has been downloaded 10x more than Fire Emblem and has been available a lot longer than FE, FE made more money on mobile than Mario Run did.
This just goes to show how much damage IMO iOS/Android has done to the casual gaming market .... they hate, hate, hate, haaaaaate spending money on anything these days. Everything has to be free, even a full featured Mario game on mobile with easy controls for only 10 bucks can't even keep pace with a free-to-play Fire Emblem title, even though Mario Run has 150 million downloads.
This is why it's pointless for Nintendo to continually chase this market ... these people don't want to pay jack shit for games. Ever. There's still money to be made off mobile for Nintendo, but fundamentally that audience does not believe in paying money for games, and that is contrary to Nintendo's business model. These people can't even pay $10 for a Mario game, they're never going to pay $300 for a game system + $50-$60 a game, iOS/Android has conditioned too many people to expect easy to play games for free, and thousands upon thousands of them.