Personally, I don't think Dubstep had fuck all to do with drum n bass.
This has changed recently, as there has been MANY a ship jumper of late,
I'm not sure that the influx of (some jaded) ex D&B heads is what the music really needed, but it has been pushing some parts of the scene in an interesting direction.
I have had one ear on the evolution through house, garage, speed garage, 2 step, grime side of things for a while now, as there is always someone/something interesting cropping up every now and again, but the most interesting part of that evolution was listening to dubstep work its way out of the London grime sound. Those guys just kept stripping more and more away from grime until it started becoming something else.
I think Dubstep took a lot of it's influences from the same places as drum n bass did (the early UK reggae/dub sound system scene, hip hop, early 90's hardcore) hence the parallels that always get pointed out, but I think on the most part, the sound evolved quite independently of drum n bass.
my 2 cents anyway.