Prediction: FE heroes will be the highest grossing FE game by years end.

[TheWPCTraveler]

I deem this extremely likely. For instance, given that FE: Awakening should be over 2 million units by this point, then the highest-selling Fire Emblem game should be over 60 million dollars in revenue (assumption: $30 average selling price) not counting DLC.
Fire Emblem Heroes can smash that by end-February.