Hope you had a peaceful christmas, Tom.
Edgy art still gets made, the mediums are just more fractured now I think, but the most challenging and original artists were never the most commercially successful or popular.
My favourite active band right now is Death Grips, experimental hip hop with a lot of rock influence that results in some of the catchiest, darkest, most unique music going right now. They're not incomparable to NIN in how they took inaccessible industrial style music and softened it with more conventional rock, DG do the same with their own esoteric style and more familiar hip hop production techniques. David Bowie actually cited DG as one of the main influences for his final album which explains its ambitious weirdness a bit. They have a sort of DIY sensibility that's really inspiring too.
Danny Brown also dropped an album in september that's full of originality and isn't watered down for the sake of accessibility (try the songs "Tell Me What I Don't Know" and "Dance in the Water" if you have time), but of course because of that you wont hear any of this stuff on the radio. I've been listening to more hip hop than anything else in recent years just because that's the genre with the highest concentration of weirdness and ambition right now.
As for other formats, so many excellent films came out this year. My favourite so far has been The Lobster, completely fucking bizarre premise, masterful execution that manages to be both extremely bleak and genuinely hilarious. And I haven't even scratched the surface of all the movies released this year. The doors have never been more wide open for people who want to make truly unique stuff.
Gaming has never been more varied and challenging (challenging in subject not literal game difficulty) than it is now, too. For the first time you can have short, one-off game concepts and stories that don't have to lean heavily into repetitive gameplay tropes or worry about a lack of content. Also consider how huge Dark Souls is now, on paper that game shouldn't be popular at all when it's so vague and inaccessible, and demands so much from the player. That's just how things are now, it doesn't matter how niche it is, if done well there will be a fan base for it.
Tl;dr from here
So the edge is certainly there, it just takes a bit more effort to find because you do have to look for it. If I didn't pay any attention to film this year and only knew about Rogue One, Zootopia, Captain America etc. I'd think it's been exceptionally boring, I wouldn't have connected with any music if I only had the mainstream. But having dug a bit deeper... I think it's immeasurable how brilliant every art form is right now, at least imo. I'm constantly having my mind blown.
Someone threw a few mentos into the proverbial coke bottle of pop culture when the internet became a sustainable platform for high quality content. The mainstream (the stuff that's still sitting at the bottom of the bottle if we're sticking with that) has never been more stale, but you just need to look up at what's splattered all over the walls. The barriers for entry and for limitations are almost gone entirely.
Internet content on the other hand I do feel has been blunted very recently, thanks mainly to youtube favouring certain types of content, and hasn't bounced back just yet. If NG could become known as a place for work like A Prank Time, to contrast an internet full of gameplay, cringe compilations, react channels and whatever else, that's certainly a place I would support.