What then happened was a major overload of games, most of which were not worth buying, and consumers got feed up and simply stopped buying.
I got a Wii about two years ago, and haven't bothered to even browse the Wii section of games in stores in probably 1.5 years. It's basically just a convenient emulator as far as I'm concerned - it's simply not worth the bother of browsing through the gobs and gobs of utterly horrible movie-tie-in and mini-game shovelware to find the bare handful of games that are Wii exclusives and worth playing. I can understand trying to hit a broader / more casual market, but I don't think anybody can deny that the vast majority of Wii games are simply shit without crossing their fingers behind their back.
When we write programs that "learn", it turns out we do and they don't.