I wouldn't dismiss the possibility that some "casual gamers" who played stuff like soccer games with their friends on PS2 still haven't upgraded to a current gen console. And those people won't buy a Wii either, because they want to play new FIFA games, etc.
And some may have bought a Wii but quickly stopped playing because it didn't offer them what they wanted, and instead waited (or are still waiting) for the price of the HD consoles (especially PS3) to drop even further.
It should also be taken into consideration that not all people who played videogames on PS2 still play videogames today.
"Well certainly with the Xbox 360, we had some challenges at the launch. Once we identified that we took control of it. We wanted to do it right by our customers. Our customers are very important to us." -Larry "Major Nelson" Hryb (10/2013). Note: RRoD was fixed with the Jasper-revision 3 years after the launch of 360
"People don't pay attention to a lot of the details."-Yusuf Mehdi explaining why Xbone DRM scheme would succeed
"Fortunately we have a product for people who aren't able to get some form of connectivity; it's called Xbox 360,”-Don Mattrick
"The region locking of the 3DS wasn't done for profits on games"-MDMAlliance
Essay Pro