That´s not a problem, they are already flexible with its prices, some games like Captain Toad, Splatoon and Yoshi are 40$ here in europe (CT in US too) Tropical freeze was 50$

Cheaper games will be at 40$ and expensive games at 60$, probably. 

Why all people thinks the portable side of the console will be as big as the homeconsole side?

I think that if NX is Nintendo fusion the console will be like WiiU but more little, the difference is, the gamepad will be able to play the same games with less resolution and less stuff in general, and when you play on TV the other part of the console will do the rest of the job, making it more powerfull as a home console than as a handheld.

I´m thinking in a console with 2 parts. One conected to the TV and one independent.

You do realize that most of the games on their handhelds are 3rd party?

They wouldn't be able to make games fast enough to support it with JUST Nintendo games.

Can the console succeed in the scenario you just described? Maybe, but like you mentioned only a moderate success. But I guess it doesn't matter if their in the lead, I know it doesn't to me.

Third parties have become a big part of the gaming scene. People want variety, without it Nintendo will just make another secondary console as you also mentioned.

I agree it can succeed without them, to a degree. But I disagree that it doesn't NEED them. If anything, 3rd parties don't need Nintendo to succeed, they have Sony and MS platforms to make games for.

Without 3rd party support, NX will be dead faster than WiiU. The market for Nintendo games is very limited and narrow, and withoit other games it will be near impossible to sell it, regardless of the price.
And if you believe that it will cost $200 for two systems, you are in for a big surprise (unless they decide that Gamecube level quality is what customers are willing to accept).

The top 10 of best selling games in 3DS are all first party games.

Truth is - everey four years you get the double amount of performance at half of the price.

So its only a question of time when a 200$ Wii U successor will deliver the same performance as a PS4.

As the real next gen GPUs and APUs are just around the corner and doing a quantum leap by utilizing HBM - the mentioned time frame can be even shorter...

It also goes against all Nintendo pricing models to date.  They aren't exactly in any hurry to drop hardware price as parts/labor costs decline, so I think it's unrealistic and against all historical evidence, to suggest they'd do otherwise.

Nintendo has always had to build their own success first... That's always been the case. If they can start off well with the NX, then the 3rd parties will jump on board to leech off the success.

Gamecube proved that even at $ 99,- Nintendo's exclusive line-up is not enough for a good selling system(and the Gamecube actually got some 3rd party support to).

Gamecube was not a handheld too, GBA sold 80m with similar conditions, even the same price.