Famitsu Sales: Week 14, 2024 (Apr 01 - Apr 07)

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Switch's longevity in hardware sales at this point comes down to how quickly Nintendo choose to phase it out.
If they really wanted to keep it around, I can see it still moving meaningful numbers for years to come. It's reached the point where it's evergreen catalogue is so strong that it just keeps going and going even without major releases.

I suspect though that when the time does finally come for its replacement, it will probably be put out to pasture relatively quickly like DS and PS4.