I'd say George R. R. Martin since he keeps putting off finishing the Fire and Ice series (Game of Thrones) with a bunch of side projects. We'll never get to see the end of the books I bet HBO will finish the series before George finishes the sixth book.
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Lol but then the first Destiny book would start off: "The sunlight filtered into the dark room, outlining the soft shape of the Guardian's wiener." XD