At our work, for our members that use our services we have moved to HTML5, and provide download links to installers for Firefox or Chrome, or on USB for members that request it.
We posted a cd in our last member newsletter.
We simply don't support IE anymore, and our services block the IE browser and redirect to a download link.
If a member asks, "is this Firefox and Chrome better?", we say Yes. Not one has questioned that and like to feel they are moving on to better things.
Our developers had a gutsful, our members have buy in, and as a Manager, I support them.