Interesting theory. What facts and/or figures is it based on?
It's pretty obvious the influence of today's fiction has been influenced by the presence of gaming in general, especially the effect RPGs and video games have had. Take a look at all the D&D clones out there, and how the D&D game has affected just about all the Video RPGs out there. Record of Lodoss War was a D&D campaign, or how books like the Economist covered the death of Gary Gygax and the influence on the culture. Authors who started in gaming have mass followings, etc. Just look at the Wikipedia articles and references.
This is pretty much the circle of life. At one time for instance, Lil' Abner was the most popular comic strip and had an impact on the culture. You couldn't go anywhere without finding LA merchandise such as Shmoo figures. Then Charles Schulz with Peanuts ended up replacing this in pop culture. I see D&D as the Peanuts that eclipsed Lil' Abner. Something too will replace D&D as the major influence on fantasy, just give it time...
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