I'm not convinced google learned anything with android WRT pushing GPU vendors to release driver source. Fuschia looks like it will only be a repeat of these problems.
I think they have learned the lesson that GPU venders will never release their source code. Fuchsia seems to be designed precisely to accomodate that fact - drivers are well isolated and speak to the kernel through a well defined (and hopefully stable!) interface (I think this is FIDL).
But I don't see how that is relevant here because this thing is based on Linux and X11.