it is forkable, but I agree that to do that you need a very big company and someone who understands the codebase (same reason that in a way hindered the ClassicCommerce efforts). But I am sure at a certain point when CP has gained momentum someone will code an e-commerce for CP. It is bound to happen.
Technically, Visual Composer (or whatever its called nowadays) should also work with CP, as it basically is just a nice UI for a shortcode orgy.
There also is some kind of Bootstrap-specific page editor that looked promising a few years ago, but I sadly cant seem to find it at the moment. Still, got its sources saved here somewhere (also, it was on github … I think), so it should be still good.