[daveoc64]

The most recent versions of the .NET Framework (including 4.8, the final version) are supported for as long as the OS they are installed on is supported.

I think that because of that longevity, you're going to see lots of the main libraries etc. supporting .NET Framework for years to come.

[9wzYQbTYsAIc]

Developing to the right .NET Standard spec will ensure compatibility between ‘old’ .NET Core and the legacy .NET Framework 4.8. Libraries that do so would be limited in their ability to use new language and framework features though.