>>215784800 (OP)
In the early 90's the rave scene happened and everyone was doing E and making insanely boring dance music that was easy for drugged up mongs to dance to, then Brit pop happened which was good but it looked back rather than forward which isn't good for a culture. Then we had some good music things in the 90's like Trip hop and Drum and Bass but they never captured the culture assigning a lifestyle, aesethic and imagine to their genres like rock and hip hop did.
In the 2000's american hip hop utterly dominated and became the new cool genre with it's own lifestyle, aesethic, fashion, slang etc and it simply can't be remixed by Brits like other Americans because the culture is so centred on low class black american ghetto scumbaggery. Now we have a massive second generation immigrant population with an identity crisis who larp as black yanks but no one is going to play along with them.
I also think stuff like ageing population and less nightlife has had an effect too, so a bunch of things.