You cannot just sum up random numbers, especially if some systems were released many months ago. And if you imagine Zelda OOT and Mario 3D Land on Ipad, and Android, it would sell extremely well given the huge user base of over several 100 million units. Billions of Dollars for Nintendo without any effort would be easily earned.
The only other option they have is releasing an own smart phone but if they don't they will die out slowly since the classic handheld market has no future. In 10 years from now, these devices may not exist anymore.







