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 wants a “smooth transition” to their next-gen console through Nintendo Accounts - Meristation

Nintendo Switch unit sales worldwide 2017-2023

How to create a new Nintendo account on Switch

Nintendo Switch 2 Expectations: Is It Coming in 2024? - CNET

Nintendo Switch 2: 5 features we want in the next-gen console

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

20 Years Of Nintendo Console Sales [OC] : r/dataisbeautiful

Why console gaming is dying

Sources: Nintendo targets 2024 with next-gen console : r/NintendoSwitch

Nintendo Switch 2 rumors: Expected release date and what we want to see

Nintendo Switch Packaging Expected to Shrink By 20%

Xbox Series 2024 Refresh and Next-Gen Xbox details leak out, Microsoft considering AMD Zen6 and Navi5 architectures

Nintendo's Next-Gen Console Likely Won't Arrive Until 2023 At Least

Why Can't Nintendo Offer Both Virtual Console And Switch Online?

Does Nintendo's Next Console Have To Be 'Another' Switch?