I think people give those two guys too much credit for the success of Game Of Thrones. They adapted source material that had sex, swords, dragons, zombies, and shocking twists, that shit sells itself. Star Wars fans, on the other hand, are very polarized right now, so those dudes got their work cut out for them.
One more thing, why has everyone tasked to work on Star Wars since Disney bought Lucasfilm been a white dude? You would think a studio run by a woman would give some other folks a chance.