You are quite the speeker (writer) and I hope you are right.
Since I bought my Wii, 4 other in my family as either bought or going to buy a Wii system. Mostly for the Wii games and especielly Wii fit. But most of them loved Galaxy and Guitar Hero III as well.
So I think it will continue that way and spread like wild fire over the population.
But Wii selling more then the entire PS-family, no effing way.
Predictions for December 31st 2008:
Wii 38,000,000
DS 84,500,000
PS3 17,000,000
PSP 41,000,000
X360 23,000,000