The whole reason Microsoft gave up on their own engine is because no one was using it, not even inside the company. Why would Edge suddenly become popular just because of a rendering engine change?
... because it is the default on Windows? The marketing effort of Chrome can be chipped away if "they are basically the same", which is a fair comment now that Edge is basically a glorified fork of Chromium
It will be interesting to see what message Google goes for to try to convince ChromiumEdge users to switch over.
A features-based approach seems iffy. They can't push speed or site compatibility anymore, assuming MS doesn't completely mishandle the build. Even tiny Vivaldi seems to remain coupled closely enough to Chromium releases that it will be hard to say "theirs is so out of date and missing the latest and greatest."
If they try to deliberately hobble ChromiumEdge, it seems like it wouldn't look good to regulators. "We didn't test Gapps on Gecko, oops, it breaks" is one thing, but it's hard to keep a straight face saying "it mysteriously works in our version of Chromium and not Microsoft's"
Many of the differences they'd likely differentiate on (the sticky Google login, telemetry) are not features for the consumer, they're the features that benefit Google and justify the cost of developing a browser.
It's not nothing, it just wasn't enough by itself to overcome the competition.
In the web's short history we've already seen several browsers rise and fall. It's possible Microsoft may in the future repeat what Google achieved with Chrome if it can find a new edge to compete, pun intended.
