If one person plays a console that didn't play a console before or with in recent history, than that console expanded the market.
Have more people who haven't played a console in recent history played the Wii than most consoles?
Just look at who is buying Wii's middle aged non-gamers for them selves or for their kids.
Either way that is expanding the market. More so than SNES or PS2 I would be willing to bet.
I would cite regulation, but I know you will simply ignore it.