Nintendo is letting 3DS cannibalize Switch

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Nautilus said:

And to play Devils Advocate, thats somewhat normal for the transitioning period.I guess that 2017 will be the 3DS final year, in terms of support.After that we will see full support to the Switch(even though you could say that 80% of Nintendo efforts is already on Switch)

But see, this is what concerns me; what if they plan on keeping 3DS alive beyond 2017, or even making a successor to it?

The idea of having all Nintendo games on one platform instead of split between two was arguably the strongest proposition in Switch's favour, but Nintendo isn't acting like this is their plan.