Actually racing games as a genre are pretty huge on iOS/Android ... Real Racing 3 I think someone was saying has 300 million downloads, Angry Birds Go has well over 100 million downloads, which is more than every Mario Kart game combined has sold.
Mario Kart would be big.
Even Zelda I think could work on iOS/Android, Nintendo already did (basically) touch only Zeldas on the DS and they worked well enough. If the Final Fantasy games do very good business on mobile, I think Zelda would too.
Those races are mostly motion controls racers. Angry Birds mobile game in its core. You really comparing downloadables of those free or $1 games with sales of $60 game!?
Get real, you cant have nearly same experience of 3D Zelda BotW on big TV with physical controls compared to mobile platform.
And we already know Nintendo said they will make specific games for mobile platform, not ports of their games for their dedicated platforms.
Nintendo not leving hardware market, its so obvious.