What Happens to a Book Series Unfinished?

Does it dry up like A Game of Thrones in the sun? Or fester like A Wise Man's Fear, and then run? Clare and Hannah talk about book series that authors have left unfinished, and the repercussions of that. Should authors be obligated to finish their stories? Should Patrick Rothfuss and George R.R. Martin be locked in a remote cabin together until they finish their series that have gone fifteen years…