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I honestly don't think tablets are on Nintendo's agenda. Considering the success of making the wii u controller a mixed tablet and controller and the huge failure of that design I just can't see it, tablet is probably a dirty word at Nintendo. I think Nintendo are just interested in making sure their handheld's sell well and possibly withdrawing form the home console market. The tablet market is absolutely saturated anyway with ios, windows and android devices. It's even more competitive than home consoles. Many tablets are ridiculously cheap and often cleared out at a loss to the makers. I'm sure Nintendo shareholders really love the idea of making hardware to compete in that arena.
Nintendo needs successful handheld models, small models that are easily portable and suitable for and appealing to children. Decent controls and new appealling gimmicks and features.
