XNA is not Dead! It lives on through MonoGame, which implements the XNA 4.0 Framework. This allows developers using the XNA dev kit to port their games to other platforms besides the default platforms supported already by the XNA 4.0 Framework. Recently at GDC (the Game Developer's Conference) 2016, in addition to the cross-network play support, Microsoft announced MonoGame is coming to Xbox One. In an older blog post I wrote, I was asking Microsoft to allow their Xbox One dev kit to support MonoGame as well as other tools and middleware.
MonoGame is coming to Xbox One!— ID@Xbox (@ID_Xbox) March 14, 2016
“With nearly every game on the market today being released simultaneously on all platforms, the need for a good cross-platform development strategy is crucially important. Every hour spent reinventing the wheel is an hour wasted. Or to put it another way, every hour spent writing cross-platform code constitutes three saved hours.”
--(Steven Goodwin (2005), Cross-Platform Game Programming)