.NET Framework isn't EOL and is probably going to be supported forever pretty much. There are still regular updates to .NET Framework distributed through Windows Update.
"Supported"... Kind of. Showstopper stuff is fixed. Other stuff is not. My last company had two open bugs with .Net Framework on more recent versions of Windows Server that were year and half old.
.Net Framework will be supported as long as Windows Servers OSes it runs on support it. If Windows Server team ever casts it out, it will die.
