I can't say if Bradbury was wrong with his conception decades ago, when he wrote this. Or maybe he was right; if he had not written this and people have not read it, we may have had a bad turnout. What I can say is that I grew up with both TV and books, so is my daughter, but our brains didn't turn mushy. (I think!) The key, probably, resides in rearing children responsibly–exposing them equally to TV and books, teaching them which should be adopted from them, and which ones should be discarded.