Yea apparently the project is still in its infacy, from what I read big guys like elementor, divi, visual composer and maybe some i missed are looking to integrate themselves into gutenburg.
I think lesser site builders like site origin are going to get knocked off and the same for many plugin developers, I know this is a dog eat dog world but I just cant help but feel this commoditization of the web is taking food off the table from some theme, plugin developer who has spent years doing what he does. If this was a offline think you could be sure there would be strikes and appeals. I hope that it fails.
It tough though, this world is really adapt or die.