When someone writes something dazzlingly brilliant, people want to imitate it. The result is a lot of less-than-brilliant knock-offs. Elves, Dwarves, Goblin army, cursed ring, evil sorcerer. Tolkien did it. It rocked. Let's move on. Let's do something new.
I'm not implying that fantasy is for kids. I'm saying that more and more people are finally realizing that there's more to fantasy stories than elves and wizards and goblin armies.