Nintendo Accounts will continue on the next gen system in the year 20XX

It looks like Nintendo Switch Online, or some form of it, is already planned to be a part of the ecosystem for further consoles going forward.

Nintendo's CEO says its online accounts are the key to its next console transition - The Verge

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Nintendo emphasises the importance of Nintendo Accounts for its next-gen console

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Nintendo Plans 'Smooth Transition' from Switch to Next Console by Using Players' Nintendo Accounts - IGN

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Doug Bowser Won't Comment on Switch 2, but Bigs Up Nintendo Account for Upcoming 'Transition' - IGN

Shuntaro Furukawa: Switch Successor Will Utilise The 'Nintendo Account' System

How to transfer user data from one Nintendo Switch device to another

Nintendo says the transition to its next console is 'a major focus for us

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Nintendo Switch Super Mario Edition Fuels Japan Sales, Famitsu Shows - Bloomberg

Leaked Nintendo Switch 2 specs reveal how powerful the next-gen console may be