Nintendo looking to support the Switch for more than the traditional 5-6 year period

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These 'Switch will stopping selling when PS5/Nextbox come out' claims also seem to forget:

- NES kept selling after the Megadrive released

- SNES kept selling after the PS1 and Saturn released

- PS1 kept selling after the Dreamcast released

- PS2 kept selling after the Xbox 360 released

Basically, it's not at all unusual for successful hardware to continue selling after far more powerful hardware releases.