Being a little behind in the news front, I have only recently learned about PS Vita TV. I did a little reseaarch to try and understand what it was and I have come away very impressed. So impressed, I would easily buy Vita TV over an actual Vita console, especially at a possible $100 US price if released.
I am sure you all know what it is, but for clarity I will cover a few points; it is a Vita without everything except what makes it run, a micro console that supports HDMI, accepts Vita game cards and plays a major catalogue of games via download, including PSP. There is also Cloud built into it, will stream PS4 games and operates with a PS3 controller, meaning touch games wouldn't be compatible.
Now, forget the Vita TV for a moment and think just how awesome a DS TV would be. Same concept (and I don't care if Nintendo copied Sony for a change) with a micro 3DS console without the screen, that would allow for all DS and 3DS games to be played on it, as well as downloads. What would potentially make it truly awesome is that you would use the Wii U Controller. Everything that is on the bottom screen of 3/DS games would be on the Wii U controller and the buttons would apply as well (meaning some buttons would be redundant).
This would be the most awesome console ever in my view and finally eclipse the still greatness that is the GameBoy Player on the Gamecube. I still use mine and all the games, right back to the original GameBoy games look perfectly fine on my 110cm television. There is no way that DS and 3DS games are going to look worse. Sure, they won't be perfect, but who cares, the games are still awesome.
The biggest reason I don't see Nintendo doing something like this is because they are trying to control old games and force us to repurchase them digitally. It makes sense from a business perspective, but if they were to create and market such a product, it would have an enormous amount of potential to bring in many, many more WiiU owners and that in itself is a good business reason.
You would hardly ever get me off a DS TV if I could play Pokemon X/Y through my television. ANyone else got thoughts they would like to share?