The 3DS's only rival at the moment is iOS.
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At least a few of the 3rd parties are rumoured to be in for the NX launch. That is a start.
I just got a used 3DS XL at Gamestop on sale for $99 w/ a 1 yr warranty. I wanted to try it out and could return it within 7 days if I didn't like it. Turns out I love it (I had bought some games already as I am a collector).
I grew up with 3D Viewmasters so the 3D is really cool, as well as having real buttons I don't think it really is the same audience as iOS. I don't think people would give an average youngster an expensive iPhone or iPad for games.
I even downloaded the game, "Edge" which I had just bought on AppleTV. Playing it on an AppleTV in 2D with the Siri remote is abysmal. Playing it on a 3DS with real buttons AND in actual 3D is really cool.
Playing DS games on it with the larger screen is finally the way to play them (I have a DS Lite all these years).
I'm looking forward into 3D digital photography with it.
The 3DS is (or at least was) competing with Sony's much more powerful PS Vita and it's been completely crushing it, which is why I pointed out how it proves that specs aren't what sell devices. There's nothing odd about thinking that can be true for consoles too, especially since it historically has been. The current console generation is the first since at least the fourth where the most powerful console is the most successful and the weakest console is the least successful.
I don't even understand what your points about the Wii U (which are all valid btw) has to do with my post.
The Vita is a different audience. I got a Vita TV but only a few of my Vita games (again, a collector and wanted to get physical copies as Sony has discontinued a bunch of them) work with it. I'll probably get a Vita when they're $99 used on sale.
Sadly screams gimmick. Nintendo need a straight up home console sans gimmicks if they are ever going to recapture an audience and developer support. PS4 & Xbox One (but especially PS4) sales clearly indicate people just want a decent powerful home console.
Leading to the NX, Nintendo has been known for innovative features on their consoles. The Wii U was a bit ahead of its time as the controller, in my opinion, is way too big. I also heard that Nintendo should have released the Wii U with just the Pro controller instead, but then it would have just been another "standard run-of-the-mill" console (though it probably have more support, but just ports of XBox and Playstation games).
The original rumors had the NX with a handheld DS type of controller, but I don't think I would want that as I would rather just use an actual DS.
I like the latest one with the shaped screen as it would be cool to show what the buttons do for the different games and the cool physical buttons.
The latest NX rumors makes it look simple yet innovative. I hope they can get the costs down so that it will come in at $249 and the controllers around $60 (which wouldn't be too bad for a controller like that). I hope they keep the physical copies of games (cheap solid state memories maybe they can go back to cartridges or chips like the 3DS).
If this is the NX system, I'm in line for one...