Why Should It Take Two Hands To Play Videogames?

Thanks to StatePaper.com for their article discussing a Nebraska radio talk show host's plans to create a one-handed game controller. The host, Mike Reed, "has learned to play many of the games using a controller with only one hand", following an accident which happened when "an acquaintance at a party pointed a loaded .410-caliber shotgun at Reed [and fired]", leaving him with very limited use of his right arm. He says that "many games are impossible to play one-handed", and has "designed a dual-motion game controller that consolidates all movement, button response and directional function into a one-handed video game controller", although he and his partners "haven't built a prototype yet." In the meantime, are there any existing console controllers that might work for those only using one hand?