With everything Nintendo is doing with their IPs now, (Theme park, mobile etc) and how well their handhelds always sell, it's safe to say it'll most definitely do over 60m at least.
Japan who loves their handhelds will jump all over Monster Hunter, Yokai Watch, Animal Crossing and DEFINITELY Splatoon, not to mention Pokemon - where the CEO of Pokemon already confirmed they are making games for the console.
Just that alone will probably grant more sales in Japan than Wii U worldwide. Let's be real here. All of those franchises are killers when it comes to sales, plus when you hit the west with games like Zelda, Smash Bros, Mario and so many more you can safely say it's gonna do well. Even if third party support is limited like the 3DS, (which actually has decent support) Nintendo will actually be able to support the console themselves so much better than trying to develop and support two different systems at the same time.
The fact they no longer will have to make a Mario Party for both consoles, or a Paper Mario for both consoles etc... that says that Nintendo will be able to make a whole lot more. I'm extremely excited, even if third party support is limited. Which I don't think it'll be too limited.
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