In a recent interview, J.K. Rowling admitted she considered killing off Ron Weasley because she was in "an unhappy place." She says at first, she never intended to kill of any of the three main characters, but began considering it halfway through the series.
"Funnily enough, I planned from the start that none of them would die. Then midway through, which I think is a reflection of the fact that I wasn't in a very happy place, I started thinking I might polish one of them off. Out of sheer spite. 'There, now you definitely can't have him any more.' But I think in my absolute heart of heart of hearts, although I did seriously consider killing Ron, I wouldn't have done it."
Let's hope George R.R. Martin never starts feeling this way. He just might blow up his whole world.