IE8 will be around for years because XP can't get an IE9/10 upgrade. It looks like combined IE6 & IE7 are around 6.5% in North America. IE6 is around 1%. Being able to stop supporting IE6/IE7 is still huge. Yesterday I noticed that this map app no longer supports IE7.
http://map.itoworld.com/road-casualties-usa
"Sorry, you are running an old version of Internet Explorer which is not supported. For more information please visit here "