It will be interesting to see how the Chromium clones like Vivaldi and Brave hold up. I know they have stated that they will continue to support MV2 ... but talk is easy. Many of these clones depends on Google search revenues, so it remains to be seen if they "walk the talk".
Yeah, once Google has ripped all the MV2 code out of chromium it'll be very interesting to see how long the chromium reskins are able to maintain their private forks.
I also expect Google to be a bad actor and do everything in its power to pointlessly refactor the chromium codebase specifically to make keeping MV2 alive as painful as possible.