Well, it is true that today's fantasy seems to be "darker" by default, where witches are bitches, but actually on the protagonist's side, every king is either a power-hungry prick or an idiot in shiny armor, and every knightly order is a military arm of an oppressive religion dedicated to stomping down on free thinkers... I remember that was something new and exciting to me when after exposure to Forgotten Realms I had my first run-in with The Witcher saga, but then again, (1) I was 13 at the time, and saw any attempt at "darkening" as cool and edgy, and (2) it didn't take me too much time to notice that they've basically exchanged one set of tired cliches for another.
But then again, what isn't "darker and edgier" these days? The fascination with zombies and vampires seems to have reached an all-time popcultural high, no music band ever comes out without completely black outfits and eyeliner (whatever happened to the guys who just wore jeans and old t-shirts?), and pretty much every reimagining of an old franchise is marketed as "darker and edgier". It's not just about fantasy and not just about videogames.