All companies, software developers, designers and usability experts focus on Phosh only now and have all devices be able to run the same OS with ultimate GUI, all apps in a single app store.
Next, apply the Nexus strategy by having a pool of manufacturers showing off what they are capable of by pushing the Phosh devices to highest levels in terms of technology, marketing and awareness/acceptance of the market.
Manufacturers will be shipping out their devices with Phosh before you know it. They have been constrained by Google for too long, so have million of users. Next step for the manufacturers is to make the devices blobless and we should be able to see a major shift in the market.
It will even make DRM companies (Netflix, Spotify etc of this world) aware they need to push their platforms towards RYF in order to maintain their position.
After that fork whatever you want, just make sure the open source is presented as a unified product with excellent basics. From that point forward educate the users what they can do more, so much more with their Linux devices.
Then people will have the choice to what they really want and move away from the Big Techs. In my opinion this is the only way to make open source a success and generate revenues to keep all idealistic parties alive.