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.
Also more than a few major US corporations. Some of which can't upgrade easily because of third-party tools that don't support anything newer. Or worse, internally developed software which is still in used, but is hard to upgrade because the original developer moved on, and no one is tasked with maintaining it.
This is my client base at $dayjob. As of last year, the last of them had finally let go of IE6. It would be nice to think our influence had something to do with it, but Microsoft had been trying to get them to ditch it for years, and they have a hell of a lot more pull than anyone else.
