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

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Pavolink said:

My guess is 2022 for the succesor.
Full retrocompatibility.
Some 2022 and 2023 Nintendo titles to be released for both consoles.
From 2024 onwards everything is for 2witch.

I think 2022 would be too soon; that would give Switch a shorter time before succession than the 3DS despite it selling way better.

This phased transition some of you are plugging doesn't seem likely either, as the whole point of the Switch is to unify their development efforts into a single system.