Maybe about five years. It depends how much Microsoft choose to change the explorer interface. If the explorer interface remains stagnant in favour of the metro interface, chances are a lot of apps will still run on XP.
Remember that Microsoft are supporting Windows 7 until 2020 which also comes with an "XP mode" for older apps. As much as I've always disliked XP, it may have a while left in it... unofficially at least. Especially since the desktop interface is nearing the end of its evolution in favour of touch.
Remember that Microsoft are supporting Windows 7 until 2020 which also comes with an "XP mode" for older apps. As much as I've always disliked XP, it may have a while left in it... unofficially at least. Especially since the desktop interface is nearing the end of its evolution in favour of touch.