Besides pushing it to people who are clearly upper class students who likely use protest signs and Tumblr more than console games a few things came to mind.
1. No sign of dual screen usage, certainly not in mobile mode (which propelled the DS success).
2. There are USB plugs in some shots, but no reference can state usage of direct modem linkup (to avoid lag and slowing online), nor does it suggest backward controller compatibility (like Wii U’s Pro Controller, I use it on steam, I like it better than that shitty X-Box).
3. You need more than one with family and room mates as a mobile system not as a standard console. Maybe if price specifics were mentioned earlier this objection would be smaller. But imagine having 2-4 switches at your house and no professional reason to. Especially family, that’s when you don’t let kids have it in their room and you have a game room.
4. The separated controllers, only good for small hands. You see that blonde chick on the reveal? She was be 5’1, I am gigantic. How Fils-Amie would play it, that would be something to see.
5. They made it look like a pretty Vita that Vita people really wanted when the PS Vita’s TV item came out.
6. We only saw style and no substance, you want to excite people, tell people everything, make sure they feel fully informed about their consent to buy when they plan things out.
7. You’d think they would have picked a new Metroid Side Scroller and Mother 3 as a starter game for this system. Rather than a LoZ that looks more like a lit up DarkSider’s game.
The Good thing: Carts. But they could have added a USB drive to Wii U for this.
As for hybrid, and IR device like the Steam Link could have been made for the 3ds.
Well that’s it in a nut shell. Should be a Nintendo Direct to barely answer this and other skeptical problems of shrewd consumers who don’t want to spend money if they don’t have too, even if, like me, they love Nintendo in most cases (not N64, except Wave Race).
*Oddly enough when this site was on Dragon Fire I posted a system like this (late 90s) in support of Carts and hating chrome hand helds, when a Game Gear was around (or Lynx). I thought of how plugging a game gear sized thing into a bay may improve things and run the software on TV. Called it the Matrix at the time, my “Polygon Begone” article was showcased back then.