I don't care if authors don't finish a series, or if I start a series that's unfinished and it certainly wouldn't affect me buying a book I wanted. Life's way too short to worry about wether a book series will be finished or not. There are more important things in life.

To be honest I wouldn't read Rothfuss' now anyway after book two was so laughably disappointing. If Martin eventually publishes another Ice & Fire book, I'll happily read it.