This sounds suicidal.
Nintendo doesn't want to depend on third parties or anyone else. They don't want to sell expensive hardware and they absolutely don't want to develop AAA PS4 level games.
Nintendo are the platform holders, so, by going with one hardware configuration or the other, they're deciding what kind of games can be done for their platform. If they released a powerfull console, they would have to use said power as third parties would use it. Nintendo doesn't want to enter that game.
Nintendo is a small company, yet they develop many polished, mechanical refined, "nintendo quality" games. A quick look at the competiton will tell you how they do that. Nintendo's games are simple, smaller in scope, "technically unimpressive" and have small teams and modest budgets.
Now you may be thinking about Zelda, the proof that nintendo can have an actually big team developing a more ambitious game while maintaining nintendo's desing philosophies, polish and "nintendo quality". Well, how often do they release one of those? When was skyward sword released?
Developing multiple "the legend of zelda level games" would probaby end up in dissaster.
And how would nintendo even compete graphically!? A significant part of nintendo's developers are used to 3ds level games for jesus christ! the rest to wiiu level games.
And what would going with a powerfull console mean for the handheld!? What about the plan of, from now on, going with a single architecture? What about the console and the handheld sharing some of the same games!?
Why wouldn't you base all these decisions on what is better for the handheld, considering that is has always been, you know, what makes the most money?
It seems more reasonable to go with the unified architecture route: both console and handheld to be ARM.
The transition would definitely be easier with a no so powerfull console. Nintendo's developers won't have to suffer another awfull transition like from wii to wiiu. Remeber the first year? lol and people want them to release "ps4 level games".
Develop one version of most games then optimize it to both the console and the handheld.
Keep developing simple "nintendo like games", with relatively small teams. You don't have to release a different game of each franchise to each platform anymore, you simply release one. Take advantage of that to release plenty of " nintendo quality" games. By the way, now that you don't have to release two 3d marios, two mario karts, two zeldas, two smash games etc... maybe now you have time to use other franchises.
And so on.