I guarantee that the next Nintendo system will be 100% compatible with every single function of the Wii. It may not be a sequel to the Wii (y'know, may go a different direction than the Wii went), but it will most certainly allow usage of all Wii functions.
Given that you NEED a disc drive to use all Wii functions, it WILL have a disc drive. It may not primarily USE discs, but it'll have a drive. Of that, I'm certain.
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