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.

How to cancel your Nintendo Switch Online subscription

Last Chance: Nintendo Stops Selling 3DS, Wii U eShop Games Today

Why console gaming is dying

How to gameshare on Nintendo Switch

Nintendo Switch Successor Rumored To Have Been Shown To Press/Devs At Gamescom : r/nintendo

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

Nintendo Switch Successor Chip Rumours Are Doing The Rounds Again

Gaming Statistics 2023 - TrueList

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

nOS Turns Your Nintendo Switch Into a 'Surprisingly Small Personal Computer

Nintendo Switch Successor To Release in 2024