I don't think the K-12 system is going to upgrade because AngularJS is dropping support for IE8. I mean, I don't think it'll be a major factor in their decision. Probably funding will be a big factor. Then AngularJS.
But they will change soon enough. It is just that IE8 is the ceiling of Windows XP, which is end-of-life in 4 months. If that does not convince, the bad press of all the vulnerabilities that follows, will.
Another driver: ipads and chromebooks are taking over.
