I think having loads of genres is a good thing, it makes it easy to spot someone who doesn't operate within them, and does something original or interesting.

Plus you have a small handful of big names, DJs, producers, promoters etc within each little scene. If you replaced that with one big scene, you'd probably end up with a much smaller amount of people making a much better living, fewer labels and parties to choose from, and fewer opportunities for young DJs, producers and nights to try and establish themselves.

It's good that a lot of people try not to pay too much attention to genres here, but they're never going to go away, and they can be handy as a rough guide or to help describe music. It's just a shame so many people take them as gospel, or worse, exploit them for themselves.