That would be a machine I would actually buy. It would be so cool if they came out with a console that let you play classic portable games on your TV screen. GameBoy, GameBoy Color, Game Gear, Atari Lynx, Neo Geo Pocket, WonderSwan, etc. Image a console that could accept any of those carts and play them at home on the big screen.
I'd love just to be able to play my Game Gear games on something other than a half-broken Game Gear.