Well, you're citing Lord of the Rings and the Hobbit as predating D&D, but then so did Conan, as Robert E. Howard predated Lord of the Rings and the Hobbit. The Hobbit came out in '37, Howard died in '36. And, you can't really compare a modestly successful cartoon like Lord of the Rings to the mega blockbuster multi-Oscar winning trilogy and call it a wash.
And, the Narnia movies features magic, evil witches, minotaurs, centaurs, gnomes, dwarves, fauns, etc. Many staples of D&D.
I grant you there is a lot of Fantasy being made right now. But most of it has little or no relationship to Dungeons and Dragons in my opinion. YMMV. Narnia still does not strike me as owing anything to Dungeons and Dragons. Pan's Labyrinth and Photographing Fairies both had fairies in them also, but I don't think of either as being particularly D&Desque.
I will also grant the tremendous commercial success of The Lord of the Rings, which has led into a few other fantasy titles being made (success breeds success) but the first Conan film did the same thing, lest we forget...
That being said, one should still acknowledge that the eighties were a hey-day of the barbarian/fighter sword and sorcery fantasy genre in low budget film (and a few high budget). The Princess Bride, Ladyhawke, Excalibur, The Barbarians (starring the Barbarian Brothers), Yor, Hawk the Slayer, Clash of the Titans, The Dark Crystal, The Last Unicorn, Dragonslayer, Willow, The Sword and the Sorcerer, Krull, Legend, The Warrior and the Sorcerer, The Gate, The Neverending Story, Sword of the Valiant, Red Sonja, Big Trouble in Little China, Amazon Queen, The Company of Wolves, Labyrinth, Highlander, Erik the Viking, Time Bandits, The Adventures of Baron Munchausen, Wizards of the Lost Kingdom, plus those we have already mentioned: Conan, Conan the Destroyer, Ator the Fighting Eagle, The Cave Dwellers, The Lord of the Rings, The Return of the King, Beast Master, Death Stalker 1-4, and, lest we forget, Mazes and Monsters...
Many of these are rather notable movies and stack up very favorably against most things being made today...