Have been thinking about a bit similar idea for the SteemPi tv-box project, started thinking about it when working on adding Retropie (retro game console emulation). RetroPie makes it possible to play a lot of old games and it also have support for online "netplay" of the games. i didnt look into the netplay part. to much other things that need to be done first for the project, but i did find a discord server where people ask to play old console games in multiplayer online with RetroPie and Netplay.

it would be awesome to have a Steem powered game lobby where people can challenge other users for a game of Mario kart, or Street fighter, Bomberman etc.

Gamers probably love a challenge like this and this way could generate a return for there efforts they put into there favorite (classic/) games.