I guess the theory is that Windows 7 can run Edgmium, but not Edge Classic, so at least Windows 7 users could upgrade from IE11 to Edgmium. But the problem with that theory is that Windows 7 expires from security support in April and if those users aren't already contemplating their next Windows upgrade then yes, why would they bother upgrading IE11 to Edgmium? Especially because wouldn't they already just be using Chrome in that case?
Yes, I know that Edgmium will also have the ~crutch~ ability to run IE11 in specific tabs on Windows 7 (and 10) so corporations stuck in IE11 for "reasons" can have their cake and eat it too, but that's still doesn't mean corporate developers can stop supporting IE11, that means corporate developers will be asked to continue to support IE11 because GPO-ing the entire LAN to use IE11 "compatibility tabs" is easier than picking and choosing individual intranet sites that require IE11 because of bad vendors. (If your corporation or client is stuck with supporting IE11, it is likely stuck forever. IE11 will never die, because corporations won't let it.)
Yes, I know that Edgmium will also have the ~crutch~ ability to run IE11 in specific tabs on Windows 7 (and 10) so corporations stuck in IE11 for "reasons" can have their cake and eat it too, but that's still doesn't mean corporate developers can stop supporting IE11, that means corporate developers will be asked to continue to support IE11 because GPO-ing the entire LAN to use IE11 "compatibility tabs" is easier than picking and choosing individual intranet sites that require IE11 because of bad vendors. (If your corporation or client is stuck with supporting IE11, it is likely stuck forever. IE11 will never die, because corporations won't let it.)