Except that WinForms doesn't work on UWP applications other than via Project Centipede and is officially on support as it was communicated at BUILD 2014.
Of cause. My point is that so many business applications are Windows Forms, and will continue to be so for many years to come.
Removing WinForms will disenfranchise a large group of developers, that for one reason or another, it could just be stubbornness, won't switch. Microsoft will sooner kill of WPF than WinForms, to not lose those developers. At least that's my belief.
"Windows Forms is continuing to be supported, but in maintenance mode. They will fix bugs as they are discovered, but new functionality is off the table. Oh, they stress that it isn’t called “WinForms”."
As I don't have time to search for the video on Channel 9.