I think you may be misunderstanding GP's clarity around the intended scope of the project with a lack of enthusiasm about maintaining the project.
Homebrew is critical infrastructure, which is exactly why it shouldn't change dramatically.
Now, if GP has lost interest in the project, or doesn't have the time to keep it running satisfactorily, I'd definitely agree with you - but I didn't get that impression from his post.
If I understand correctly, it's not about losing interest but ensuring there is a successor for when GP wishes to step back or is forced to do so. The community should acknowledge this and fund training and possibly salary for who's next.
I’ve been working on finding a successor and ensuring the project has a bus factor of more than one for at least. The latter has been solved but the prior won’t until I step down, despite my best efforts otherwise.
Homebrew is critical infrastructure, which is exactly why it shouldn't change dramatically.
Now, if GP has lost interest in the project, or doesn't have the time to keep it running satisfactorily, I'd definitely agree with you - but I didn't get that impression from his post.