Perhaps I should rephrase then my assertion. There was more dungeons and dragons style sword and sorcery movies being made in the 80's than today. Most of the movies you cite have very little to do with Dungeons and Dragons by way of inspiration or feel. I mean, really, Harry Potter as D&Desque? Lemony Snicket? I can't really see it, sorry.
So, you cited half a dozen sword & sorcery films from the 80s, some very obscure (Ator?) and two children's cartoons, yet that is given more weight than 3 Lord of the Rings movies, plus the Hobbit, 3 D&D movies, a new Conan movie, the 3 CS Lewis movies, Eragon, In the Name of the King, Pathfinder, the 13th Warrior, Beowulf and others? All of them are D&D-esque in nature. Not to mention a slew of fantasy on TV, led by A Game of Thrones that was non-existent in the 80s. Yes, some of it is not D&D esque, but plenty is.
And, if you're going to site Ator, then I'd also list SyFy channel movies like Fire & Ice, Age of Dragons, Dragon Storm, Dragon Fighter, Cyclops, Attack of the Gryphon, Wyvern, Goblin, Manticore, George & the Dragon, Minotaur and probably a dozen others, as the SyFy channel movies probably have larger audiences than Ator and are all D&D like in nature.
Additionally, as a popular culture touchstone, D&D was almost non-existent back in the 1980s, other than the occasional article on somebody accusing D&D being Satanic. Now, as I said, it's regularly referenced on popular TV shows, and not just Big Bang Theory. I'd also argue that mentions on BBT, Community, Colbert, etc don't marginalize the game at all. It has to have some level of popularity to be used in sitcoms and on nightly talk shows or else nobody would get the references. It was marginal in the 70s, 80s and 90s because it was never mentioned in popular culture. If D&D was that popular in culture in the 1980s, it would have been made a passing reference on Letterman or Carson or in a popular sitcom at the time.