I'm going full-on pessimism with this one. Nintendo just seems to be smashing together different tech haphazardly and hoping it sticks.
The system's biggest fault is its size. If Nintendo wants me to use this as a portable system it needs to be able to fit into my pocket...as Nintendo handhelds have been able to since 1996, with the original DS hardware being the only outlier.
And no, I'm not going to start carrying around a manpurse just to play portable games. Hopefully a "Micro" system is in the cards for future release.
I'm also concerned this means the end of games made intentionally with a handheld in mind. Why would Square Enix make a Bravely Default when they can just port over Final Fantasy XV instead? Why would Nintendo make "A Link Between Worlds" when Breath of the Wild is playable on the system? There's so many experiences on the 3DS that were made with shorter play times in mind that I'm afraid are going to fall by the wayside just because now this thing plays the "big boy" games.
These promises from third parties from support are great and all...until you remember this:
In other words....riiiiiight, sure thing guys. I'll be sure to appreciate your six months of software support before you abandon the hardware completely. I'm looking at you EA.
I think this will frankly be a repeat of the Wii U in regards to success in the market. Sony and Microsoft fans are comfortable with their hardware, mobile gamers are satisfied playing their mobile games which means that Nintendo is selling to the same customer base all over again.
Don't get me wrong, I'm purchasing the damn thing because Nintendo's software is basically all I play anymore, but man oh man if I don't miss the Wii U and 3DS already. Sigh.