Whilst this is clearly a divergence from the Wii strategy, this doesn't sound like the strategy that gave us the Gamecube to me. I've pointed it out before, but I ditched that purple thing after just 2 years, and I would have no problem in doing the same again if the Wii U follows the same path.
The Gamecube was an all out attempt at the core market. There was little in the way of casual oriented titles outside of those they have that blur the lines (there were certainly very few all out casual titles like the Wii ___ series). So if Nintendo are targeting both eventually, then it can't be like the Gamecube strategy.
A core + casual approach sounds more like the PS2 strategy, which had the big games like GTA, but then it had stuff like Eye Toy and Buzz. The trouble is I don't think the market is currently in a position to present another PS2 like situation for anybody, and we've seen this gen (and in those prior to it) that third parties certainly won't be helping Nintendo be the company to prove that theory wrong any time soon.
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