Microsoft are going to support .net 4.8 untill the end of time. Nothing to worry about. Only if you want new stuff that will only come in 5.0 will you require the migration.
This rather misses the point of the article. The article states that ALTHOUGH Microsoft will continue to support .NET Framework 4.8 effectively forever, OSS authors will not.
That's not really how it works in practice in my experience. In some time, some thing you use needs to be patched and the latest version only runs on the newer platform.
Doesn't matter if the underlying platform is supported if the entire ecosystem moved elsewhere.
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.
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.
