that's pretty much it in a nutshell. any "scene", regardless of what the music sounds like, will usually follow this pathduck wrote:
like Elton said, it's the circle of life.
-begins with a small, hardcore community of people making amazing and original music
-scene grows and more and more producers join in. the worser ones copy the first wave or if they're a little better, copy the first wave and update / refine / push the sound forward
-eventually you have a scene larger enough for people to complain "there's loads of crap about" b/w there is actually tons of good stuff, but the whole thing is just bigger and you have to dig a lot deeper
-at this point, the mainstream who are usually keeping an ear on underground "beats" of whatever type, will probably become interested because if they aren't in tune with what's current in production, they sound old, if they sound old they aren't going to appeal to young ears or sound fresh, and the mainstream is always trying to be as fresh and youthful as possible
-generally this will mean big breaks for the larger / most continuous / most successful individuals synonymous with the scene. they will take the remixes and the breaks because they would be stupid not to. selling 500 dubplates isn't going to put food on anyones tables or buy a nice dining table for the wife or nappies for the kids and you can't be up all night djing your whole life.
-at this point the audience may start to backlash, arguing that they have "sold out", the "underground" spirit of the thing has been lost, the whole scene "isn't what it was" and this is going to "ruin" the scene.
-depending on what the music sounds like, at this point there might be a split between those that maintain the original sound, and those that now wish to distance themself from it, at which point some new music might be created that creates a new scene, and the whole cycle repeats again.
best to stop worrying or moaning, and just enjoy the ride. ultimately, if you're just taking the music on its own terms, you will hear great stuff and bad stuff at all points in the cycle, because music is only ever good or bad, whatever label you put on it, "mainstream", "underground", "dubstep" or whatever.