For what its worth I can attest that GoT and Skyrim have made it easier to get people into D&D. Ive had conversations with people who would say "Can I play a character and base them off of say a GoT character" ? Most often it would be either a fighter or barbarian class type, which is an easier/less complex class to play as first time out. Those mainstream fantasy properties also give people who wouldn't know (casual) the right words/language to use. I'm biased in that I am for anything that grows D&D and the greater tabletop gaming fanbase. I know many online have been playing/promoting tabetop gaming for the past decade too.