References to The King in Yellow have increased over time. Actually a pretty great case study for the impact of a big media burst (True Detective) in shifting what was a fairly static base of 'awareness'. Even after the peak 'ends', KiY searches stabilised at, what, twice-ish the previous levels?
Also interesting to see how other media have followed the trend, or, at the very least, extended it. A television show from early 2014, and now a (small) flood of The King in Yellow-inspired releases are now hitting the shelves in 2015, from INJ Culbard's comic book adaptation to Alan Moore's Providence to Amanda Downum's Shreds and Tatters.