"The casuals have moved on from the Wii" - Not true at all

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I often hear it said these days that the casual audience the Wii attracted has long since abandoned the console to play games on phones, tablets, and facebook.

But if this is the case, how is it that games like Zumba Fitness 1 and 2, Wii Party, and Wii Fit Plus still regularly make the worldwide top 50 despite having been out for between 6 months and over two years? And how is it that Just Dance 3 has sold nearly 9 million units on Wii in the past 7 months?