Re: What franchise has had the closest cultural impact since Star Wars
What's undeniable, however, is the impact Potter had on literature - particularly children's / Young Adult literature (including the cinematic adaptations). It transformed the landscape of books at least as much as Star Wars transformed the landscape of cinema.
In terms of being a prolific merchandising cash cow for 35 years,
Star Wars is it and I think will always be IT. It's spun-off in an incredible number of different directions and is still just as popular today as it was back in 1977, if not moreso. I can't imagine any other franchise having quite that level of staying power before or since. (Well, I suppose some of the major superheroes like Batman, Spider-Man, & Superman might come close.)
I don't think
Harry Potter's reach is quite as prolific. It hasn't produced the same level of merchandising and I think its movies were somewhat awkward adaptations. I'm not sure
Harry Potter as-a-self-sustaining-franchise will have the kind of legs that
Star Wars has.
However, as an influence on its medium & genre as a whole,
Harry Potter was a game changer. It made reading cool in a way that it really wasn't when I was a kid (which wasn't that long ago. I just turned 30 myself). It's lead to a new succession of very popular young adult fantasy--
Twilight, Percy Jackson & the Olympians, The Hunger Games, Beautiful Creatures, etc.
Now, as a movie franchise,
Harry Potter's impact has been negligible so far. Few subsequent fantasy adaptations have enjoyed much success. We got a few
Narnia films. And then you've got
Twilight &
The Hunger Games.
But I'd argue that the most influential movie franchise of the past couple decades has been Sam Raimi's
Spider-Man films. Comic book adaptations were a risky, seldom attempted genre prior to 2002. Now, they all get adapted and many have been super successful.
In a way, I think you have to look at 3 main pillars in the comic book movie pantheon: You have the earnest heroics of Raimi's
Spider-Man, the epic seriousness of
The Dark Knight, and the flippant charisma of
Iron Man.
Someone earlier in the thread mentioned
Avatar. I think
Avatar accelerated the rebirth of 3D, but that was already starting to come back anyway. I don't think it's had much narrative or stylistic influence beyond that. It's certainly lacking in cultural influence. It's a shockingly un-quotable movie considering this is the guy who had previously written
Aliens ("Game over, man! Game over!"),
The Terminator ("I'll be back."), and
Terminator 2 ("Hasta la vista, baby.").