This won't happened without a community and communities take resources to run.
What's going to happen with the entire plugin ecosystem? Say I'm a plugin developer - am I going to jump ship to an untested fork with no company backing it, or am I going to go with a safe bet?
I'm happy to see a fork of Wordpress if that's the itch that people want to scratch (more power to them!) but the value of the app isn't in the code itself, is it?