I met Brandon Sanderson last year at Boskone, I did a story on him for class. One of the big topics of discussion was his fame, or better yet, how writers have different tiers of fame and Sanderson was (and is) on the cusp of breaking out to the true mainstream.
He actually seemed pretty hesitant about it, as did his wife Elizabeth (who runs his company). He told me he felt pretty fine with his current place in the mainstream ("I'm famous to a small group of people," he said) and that the next step could be a bit disruptive to his current life (he has three young sons). So I understood that it was a step forward Sanderson obviously wanted to take, but also one that he was aware would also bring some unwanted stuff with it.
So when I see posts here saying he's being an idiot or whatever, I have to disagree wholeheartedly. The book-to-videogame pitch makes total sense. It lets him see his creation come to life in a way he loves, expands the reach of his books while still leaving him relatively out of the spotlight(Andrzej Sapkowski has hardly become a known quantity even with The Witcher becoming beloved games). It doesn't bring the attention big TV/Movie adaptations do (think J.K. Rowling, Stephanie Meyer, Gillian Flynn and GRRM), but it still brings his works to life.