I think Nintendo might struggle next gen as I can't see how they could make their system as innovative as the Wii and it is innovation that has led to their success this gen. I think next gen the other 2 will just copy Nintendo and with 3rd parties not being fan of Nintendo the next Nintendo won't have any significant advantage over its competitors. But those are much bigger companies that can boost their sales by selling at a loss (though Sony has learnt it can be a very bad idea), bigger marketing and paying for 3rd party exclusives (or in the case of Microsoft buying developer companies).
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