Well...
GB made and continues to make WP a mess. With ever growing inconsistency and increase of possible bug/failure sources. Many devs will abandon WP and head for other platforms to make them more compelling than before. So WP will lose with this GB transformation. At the end also the end users will recognise they lost those devs and that is why end users will need to spend more and more time pimping around with each block instance they put in their content.

Would have been so much better to launch the GB concept as a new brand.