I don't know why you think they should be able to survive on releasing the same games that exist on two other consoles already. Why would anyone buy a Nintendo system at all?
Nintendo's salvation lies in strong third party support, but they won't be the same games as are on the PS4 and XBox.
Game budgets for PS4 and XBone are enormous. The pipelines are huge, and hard to fill. When you've got that much horsepower, you need a lot more creative staff to make sure there's actually something worth rendering. If Nintendo produces a modestly equipped console that has decent graphics, it will be a much lower barrier to entry.