1st market NX properly and push it to every retailer as possible and have a ton of ads. 2nd make the console in the familiar architecture with PC, X1 and PS4, this would help them get 3rd party support. make sure atleast the power and graphics are somewhat in those PS4 and X1 levels, so it won't be a dull 3rd party game.

really try to expand more rather than keep your established cutie IPs, if the western audience needs M games,, collaborate those CODs, BF, etc... and get those new IPs in (or sequels from less established franchises), don't forget to market it. :)

have a normal controller as the main controller.

Strong push of third party titles, as well as first party titles.

The droughts of titles on Wii U is pretty bad.

The price tag is really important because most of us will own either a PS4 or Xbox One. It's important to note that the NX is going to try to attract customer to basicly play Nintendo specific games. Therefore the price is very important they simply can't expect us PS4 & Xbox one owner to fork over $400-500.... even $299 is a stretch. 

The WiiU would often be critized by developper for lack of power and gamer for dreadful loading time. The NX doesn't need to focus on 4k and Virtual reality type of hardware output it simly need to able to produce HD graphic and faster load time for that it will need something much more powerful then the WiiU but staying withing the price point of of under $299.99. The increase in power that I mention is not to future proof the console but rather to bring the future Nintendo console up to HD standard and performance. The NX will be much less powerful then Xbox one and PS4 that's a given.

Apparently nothing. I bought their last system.

Games

Zelda U seems much more ambitious exciting game than TP.

Third parties seem to ignore things that help them.

why would they bother with ps4/x1 level of power?. If NX is a portable, it will be much less powerfull, if it's a home console, it will be much more powerfull.

cutie IPs? Nintendo is definetely more expansive than others in the franchise department. they are always bringing new IPs (not that it's required). Now, why would they colaborate with multiplatform titles? colaborations are for exclusives.

They already have a normal controller as the main one, unless you think the NES, SNES, N64 and GC controllers aren't normal, because like the gamepad, they all introduced imputs without removing buttons/imputs. the gamepad is a normal controller with a screen.

Yeah, you're very wrong at that. Hardware manufacturer's wnt their product to be bought INSTEAD of the competitors. Expecting the manufacturers to make a console without believing in it is unrealistic.

they need to get 3rd party big games in order for them to have better sales. they are in the middle of the current gen (PS4/X1), why would gamers buy another console that is subpar to PS4/X1 to play 3rd party games. and it would be an excuse for those gamers who won't buy an NX version since it is an inferior port....

they need to diversify and market more IPs outside the Marios, Zeldas, Kirby, Yoshi.  They need to have more on Samus Aran, Bayo 3, etc...

collaborate with 3rd party of NX versions, why? because Nintendo knows, 3rd party alone coming to NX won't deliver and sales won't be great. again a chicken and egg, 3rd party supported a bit, sales aren't great, so they'll pull out. but gamers who reviewed and bought those Nintendo ports are worst than PS/MS counterparts... so collaborating it in terms of market and trying to finesse the game more...

again, a gamepad is not your typical normal controller. neither was the WiiMote.  Gamecube's design is radical and so was the WaveBird.  They really like innovation but not all innovative controllers are great.  We knew Wii as a whole is a successful but does all gamers love it? can you really play a ton of games using the WiiMote? and why would Nintendo released a Classic controller?

Classic controller or the Pro controller is the normal hardcore gamer wants, just use your two hands and play it like how it is being played.  I know Nintendo can still pull off a new type of controller like a gamepad 2 with slick, thinner design and better resolution, but how much would it cost the next console?

Even Iwata mentioned why the Wii U sales aren't great, and the cost of the gamepad is a lot hence they can't lower the console's price that much.

I think the most important aspects are a steady flow of games and diversity of genres exclusive to NX.
If they can do this, everything else will be a bonus.