Now that I think about it, you would loose the 3D funcionality, but I could live with that, and I bet the vast majority of 3DS owners could live without it as well.
...and there's the 2DS.
Right, but even though I don't care about the 3D funtionality, I would still buy a 3DS over a 2DS if and when I ever decide to get one. Personally, I hope they come out with my idea so that I don't have to buy a 3DS. The portability isn't really important for me since I would almost always play it in my home. I would just rather have the game on a TV screen with a proper controller in my hand.
For the same reason, I'm hopping they bring the Vita TV over to the US so that I don't have to buy a Vita.
It is coming to the US as PlayStation TV later this year, it was announced at E3. http://www.playstation.com/en-us/explore/playstationtv
Nice. Did they mention the price? (Sorry if it's in the link, I don't have time to check that right now). If I remember, the one in Japan sells for the equivalent of $100 US. The only disapointing part for me is that, other than Vita games, it only plays digital PSP games instedad of having a UMD drive. But I guess that doesn't matter since my PSP has the video put port allowing me to play it on a big screen.
There is a theme here if you haven't noticed: I like to play portable games on a big screen.
GB/GBC/GBA - possible with Game Boy Player
Game Gear - possible with my video out board which I plan to install soon
PSP - includes video out port
PS Vita - Vita TV coming to the US soon
Neo Geo X - came with docking station with HDMI out
Nintendo DS/3DS -........................ (I know about the capture boards, but that isn't quite what I'm looking for)