NSW is here to Stay!! It’s Life Will Be Long and No Successor Will Come Before 2025!

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Link_Nines.XBC said:

I think they can extend its life until 2024 so a successor comes out that year, but I'm not sure about 2025, there's only so much you can do against market saturation.

Or maybe they'll just do gradual but relatively frequent updates of the same Switch 1, so there is not an actual Switch 2 in a long time. 

Iirc, Iwata mentioned something like this.