Hey Chris
Just as a follow up, just got notified by Zendesk that they will no longer be supporting Internet Explorer 8, 9 & 10
https://support.zendesk.com/hc/en-us/articles/217103598
I know that this doesnt mean their impending doom, but it would suggest that perhaps the fact that the web wont allow what happened with IE6 to happen again (ie it took sooooo long to die and affected far too many corners of the internet unecessarily).
Jamie