So the problem will not IE versions that are already old (IE6, IE7) but current versions of IE - even future versions before they implement these new standards.
As these features roll out to Firefox and Chrome, users of these browsers will have to them because of the auto-update pretty quickly.
Eventually IE will implement them, maybe in version 12, and you'll have users still using IE10. Heck, maybe they won't be able to upgrade their IE because it won't run on their aging Windows 7.
Unless IE switches to the auto-update used by Firefox and Chrome, and stops dropping Windows versions in their new IE, I don't see the problem going away.
