We can deduce if the authors act logically (which they don't seem always prone to do,
for prestige
reasons, because of social circles and social pressure),
Big 5 in these domains of fiction are on a virtual
success, and should fall
very loudly in the years to come.
If you think about the Kindle's
success, a
big reason is how the device and the buying process solve a
very specific problem
for serious readers: having something to read when and where we want it.