First of all, stop thinking about casuals vs. hardcores and such. As HappySquirrel stated, very little of all gamers are actually so-called hardcore gamers, and even more important, borders between the two groups are not given, it changes. The same also goes for games, there are of course some games you'd call casual games, but it's better to call them non-games, cause that makes the boarders clearer. But we all know that the casuals are not playing a lot, this means that a company can't live alone on them, Nintendo still needs "Hardcore gamers" that buy a lot of software.
And now, finally, about your question. Of course this happened, and of course this will happen again. But as you stated, you and your siblings kept using the systems, and this will probably happen again. Also, some of those casuals will pick up TP or Galaxy or something and become more interested in games, the so-called Gateway effect. Some of course will only play for Wii Sports and Wii Fit and such, but just don't think this is something new, same happened for example with SingStar/Playstation.







