I'd ratehr have a DS than a Wii having played both extensively, the DS is innovative and has fun games whereas the Wii is just flooded with crap games that make you look like an asshat while playing them. And remember the Gamecube wasnt exactly a runaway success and it nearly destroyed Nintendo. I just find the Wii so so boring because the games are all pretty much tech demos for the wii mote.
That video is so right, why use a console to keep fit when you can get better exercise by going outside and doing those things for real? Going out for a walk and playing football etc. is going to offer better fitness training than a weird console controller.