iOS isn't the competitor to the Wii U. Making the Wii U more "iOS-like" would not change a thing (except lose more money for Nintendo). While the handheld market is dying, the console market is very much alive, and Nintendo has no competition.
Every generation, someone declares Nintendo dead. This happened even with the NES, when entering the video game market was a death sentence for any company. Something tells me you don't know a single thing about the console industry.