From what I'm reading here and elsewhere, we'd need to do some fundamental mucking into the c++ layer as well, given some data oriented hostile practices.
But yes, I think it'd be best long term to treat GDScript ad C# the way Unity treated GameObjects and DOTS. DOTS's goal wasn't to kill gameobjects, and in fact a lot of work went into bridging between the two with hybrid packages. I guess we'll see if that kind of initiative gets some momentum (and I'd love to help out if so!)