I don't think so. Plenty of DS games were designed to use both screens together at the same time, the images from one screen would continue through to the other screen. Separating the images between a TV and a game pad screen would make many games impossible to play. Plus plenty of DS games also used unique features of the DS that just wouldn't work on a TV output, like needing to physically close the DS screen to solve a puzzle of an adventure game. I know most games probably wouldn't be restricted by gimmick features and would probably work fine, but if Nintendo released a device like this it would need to be compatible with almost all games with only a few possible exceptions.