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Having those features means paying royalties/fees that at least in part go to a competitor. Sony has been involved in the creation of most of those media in some fashion, and Microsoft pays out anyways as part of other parts of their company.
Nintendo doesn't have other, major tech divisions and its fairly obvious they wouldn't want to pay a competitor if they don't have to.
And if people want to have a Blu ray, DVD, or CD player, they probably would have done it years before the Wii U came out. Unless you really, really want an all-in-one box, there's not much point in having the Wii U be Blu ray/DVD/CD capable.
I think dvd and blu ray playback would be handy. It's not a major selling point, but it would make sense seeing as they have Netflix and whatever TVii is too.
Do they use blu ray discs in some format? I know the discs are a bit different, wasn't sure if they're a modified form or something though.
They're very similar physically, but they lack some sort of compression or encoding that Nintendo would have to pay (which in part would go to Sony, who helped develop Blu ray) to legally use. I'm not sure how much else is different.