It seems simplest to keep his original version and whatever updates he feels like doing as his own thing, and if a corporation feels like forking the project to add some feature they can add their name to it. If others prefer that version they can switch to it.
It's reasonable given the people doing it are well versed in this stuff. He keeps doing what he's doing without being as annoyed, the project stays on trajectory, and individual users can switch if they feel like it to an alternative option.
ytld.org/youtube-dl
google.com/rust_icu
facebook.com/react
Don't have a domain name?
marak.github.io/faker
Not everything needs to be reinvented.
More likely, the fork would become "faker2" if they don't want to come up with a new name.
It doesn't say so explicitly, but to me it seems that a cordial "No" from the original author will probably be the end of it.