It will die fast. There is alright meager support for the system, and Nintendo gamers aren't known for buying 3rd party software. The switch will be another place to put a few Nintendo games on it, and just about it.
Made a bet with LipeJJ and HylianYoshi that the XB1 will reach 30 million before Wii U reaches 15 million. Loser has to get avatar picked by winner for 6 months (or if I lose, either 6 months avatar control for both Lipe and Hylian, or my patrick avatar comes back forever).