And then the world fought back. Cyanobacteria kickstarted a massive spike in bio-diversity. Why wouldn't this be the same? The grey goo won't be released in

And then the world fought back. Cyanobacteria kickstarted a massive spike in bio-diversity. Why wouldn't this be the same? The grey goo won't be released in isolation. There will be other entities with the same technological level, that don't want to be eaten by the grey goo. The world that exists after such an event probably wouldn't look anything like the world before, but that doesn't mean it will be a wasteland.