First, I highly doubt NX is coming in 2016.
What I'd like to see from Nintendo for their next console is a return to basics. I applaud them for being the only real game play innovators in the field for the past 10 years but forcing things like motion controls and controller screens is a bit much. Give us a powerful system capable of handling all the 3rd party titles as well as the Pro controller as the standard controller for the system (LOVE that controller, just make the triggers actual triggers and you're set) and I think you'd have a real contender. No one can even touch the value of Nintendo's exclusive content so imagine that as well as all the third party stuff? Wow.
Graphic improvements get less and less impressive as they progress as seen in this example:
http://www.therpf.com/attachment.php?attachmentid=512890&d=1439230471
So for me that's not the big thing anymore, it's the content.
As far as the Wii U goes, it was (and still is) a fantastic system with great content. It remains the primary console in my house. Sadly it was TERRIBLY marketed and was under powered so third party games once again avoided the system. The game pad was neat, and convenient in my house because my kids, wife, and I could play multiple systems (especially convenient around Christmas when multiple people get new games and all want to play). There were a few games that used it VERY well, I love local multiplayer with two screens so you can't spy on each other and it was used to great effect in Nintendo Land. Overall though, most games just use it as a map or menu screen. Admittedly it's handy but not a requirement. Where it really excelled though was with things like the web browser. Easily the best interface of any console and helped greatly by the pad.
I'd like the pad to be an option for the next system, but not forced on us. As for the sensor bar, you know you can get a wireless one right?
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It's got built in wireless. I've never had to plug mine in???