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Realistically there's only so much support you can expect for a system that sells this poorly.
The Saturn and Dreamcast and Jaguar and 3DO didn't get more than 4 years of support (in real continuos way). Wii U wasn't going to either.
It's nothing personal. It's simply business, it's like being mad a theater company for pulling a movie out of the theater after 2 weeks because it's bombing and wanting to use that screen for something else.
Besides to be honest there were still a lot of Nintendo games released for the Wii U, and a lot of very good ones. It's not like they Virtual Boy-ed it.
Systems that have trouble getting to even 15 million units sold will be phased out after 3 or 4 years. That's just how it goes in this industry, Nintendo is not a charity, they're a business. The whole "5 years or bust" thing only applies to system's that are actually successful in the first place.
