Because rpg’s depend upon words—and aren’t amenable to being condensed into any sort of symbolic imagery—they aren’t picked up by the broader culture.
much moaning and discouragement…
Yep. Bookstores may not be suffering too badly, but notice how many of them now handle movies, CD music, and coffee.
Reading is not fundamental. Television is fundamental.
…and as Ginger points out in comments:
many local bookstores are extinct.