The Game Gear might be able to run the games, but it has a lower resolution and SMS games get cropped. The Game Gear has a huge master palette and I believe stereo sound, so those don't translate properly to SMS hardware. I have seen working SMS console with a Game Gear added to them, but it was basically a two-in-one console.0
Play Turbografx. Play the Turbografx. PLAYTHE TURBOGRAFX!!!!!!