It would be interesting if Google tweaked their Chromium licensing so that Edge couldn't use it. Then Microsoft wouldn't have a browser at all.
edit: but honestly, Google could go Apple open source way, making code changes in huge dumps that are impossible to integrate back. But I an not sure it’s worth the trouble.
If they'd actually succeed in capturing the majority of the market, there's a big chance Google would throw in the towel and then what??