The title of this guy's article is horribly misleading, but what he's saying, though anecdotal, does have some merit.
Nintendo is not making a device to replace a tablet for all intents and purposes; but are instead targeting those people, similar to my girlfriend with her tablet or my mom with her DS, that leisurely play games on their tablets while the TV is on for other reasons. Being able to play a full-fledged WiiU console game in your hands with a real controller and a decent sized screen could become very alluring to many people, and the more tablet-like features that Nintendo adds (such as the Android apps, internet browsing, movie watching, etc) the more chance it has to be appealing in this way.
Nintendo's not banking on millions of people giving up their leisurely tablet use overall, but there's far more chance of WiiU having appeal in this way than there are for the millions of tablet users to care about buying controllers and playing console-type games on their tablets, IMO.
