IMO it all seems pretty cyclical - the whole post-dubstep scene's very similar to the brokenbeat scene from a decade ago.
If look at the life of an original Uk dance music genre; dubstep / dnb / UkGarrage (to a lesser extent), it slowly defies itself as a genre, building from the underground/street. It goes strong for a few years, solidifying it's sound by producing the cannon of classics that will define it. As part of its growth it's inevitable that people from beyond it's original demographic become involved in the scene. During it's height, a producer away from the mainstream of the genre, will produce an accepted genre classic - but one that pushes the sound in a new, slightly more left field, cerebral direction - like Photek, Burial, The Streets (to a lesser extent). This opens the genre and gives it a new edge that will slowly move away from the core sound of the genre. Incorporating producers from within the scene who want to experiment / branch out, coupled with an influx of new producers from beyond the original demographic and from other genres, who will push the limits of the genre. And this in turn develops a new audience.
Meanwhile the core of the genre moves through developments and stages, often becoming harder/darker in reaction to it's softer new counterpart - which leads to further segmentation. Move on a year or two and eventually, for numerous reasons, the core scene stagnates and slowly dies off. But the influx of fresh blood; producers, djs, listeners etc, into the sub scene however means that it's own life as a new subgenre is only beginning to peak. This new genre will be eclectic in nature, partly because of the nature of those involved, partly because Uk dance genres only seem to be able to survive for so long in their original form without stagnating. And one sure fire way to refresh a genre is to branch out and incorporate other genres.
Obviously this is a very broad description, but it still holds truth.