I have to agree that the main NX console will launch in 2017.
Here is what I think NX will be.
Nov 2016 NX handheld and a NX "portal", a cross platform hub, similar to Miiverse, tied to your Nintendo account, will launch.
NX handeld will be a more powerful vita not backwards compatible.
NX portal will run on NX handheld, mobile and PC. It will have a few basic and VC type games that you can play anywhere with added enhancements. Yes you will have to buy them again for the third time, but they will be finally cross play and buy.
NX console will launch in 2017, run NX portal and obviously have exclusive software. About a XB1 in power with better japanese support but pretty much the same western support outside a token exclusive or two. It also wont be backwards compatible. Remasters will tickle dowm of the WiiUs best games.