I don't think the song started anything. It was coincidental. Dubstep was already on the rise at that time. It may have had some influence, but only to a limited extent. Not only that, but dubstep itself is actually minimal on the song.
Basically, and LOL @ the skrillex mentions. we're talking about pop songs with dubstep breakdowns that became popular after HIAM.
It's no surprise though that 90% of the people voting "No it's just a coincidence" would instead have you believe that a certain someone popularized dance/electro pop even though the same excuses can be used for that situation as well.
I think it was a coincidence and would've became popular anyway, but I''m not going to say brit putting it on HIAM didn't do the sound any favors
and aside from a small handful of tracks dubstep isn't really prominent in mainstream pop (in the us)
I agree 100%,
South London made Dubstep what it is, she may have help it out to become a more mainstream (which the underground DJ's hated) but the trend was already set in London!