[irrational]

As long as MS supports IE, we are mandated that we have to support IE. As far as I know, only IE11 is still supported by MS, but support will continues until 2025. The thought of all websites we build having to be compatible with IE11 until 2025 makes me sick. Is there any hope that rolling IE into Edge will shorten the time that IE11 is supported?

[dragonwriter]

If it becomes a feature of Edge rathe than a standalone product, what is supported is now Edge (which has a feature allowing it to support legacy IE websites), not IE. That is, no one will be using a supported browser that only supports IE functionality, so while Edge users can access IE websites, there's no reason for anyone else to support IE in order to cater to those users, since they will actually be using a modern browser, not IE.