Oh, believe me, I really like backwards compatibility, and basically it's a very important feature for me (I still have a launch-model PS3, for example). It's just that I don't see how the NX can incorporate it without sticking to dead-end PowerPC processors, unfortunately.I know you're presenting this as a bad thing, but I think backwards compatibility is something that we as consumers should be expecting in this day and age.
If they want the hardware power and attractiveness to third-party developers, they're going to have to dump the GameCube-based architecture, with its PowerPC processor and all that, that Nintendo have used the last three generation. However, that would rule out backwards compatibility, and to be honest, I don't think Nintendo can be all that bothered to wonder outside their comfort zone.
Anyway, my various NX predictions in order of pessimism:
1. It'll be a Nintendo-branded, ARM-based Android tablet with a built in Amiibo reader. That also connects to televisions.
2. It's actually Quality of Life, some health/lifestyle device rather than a traditional console.
3. It'll be an overlocked Wii U with more RAM, in a different case, with a different gimmick based controller which has a massmarket appeal. (What the Wii was to the GameCube, basically.)
4. It's a competitive console to take on the PS4 and Xbone, but with a jawdropping unexpected twist.
5. It'll be a UFO-shaped decive which hovers over your head while projecting 4K holograms onto special Nintendo wallpaper for your living room.