That is the point of the commercials. To get an audience that normally would not have bought one in the first place. If they can get the message out there that the DS is not just for gamers then they can sell a crap ton more. There probably are people out there that will buy a DS just for brain age.
End of 2009 sales predictions:
PS3 - 33 Million 360 - 40 Million Wii - 75 Million