Yeah this happened earlier in DnB too with the techstep and neurofunk stuff. But they had the sense not to name their music after something that wasn't in it. I'm quite vexed by this.
Think of it this way: most breakbeat house got faster and turned into jungle in the early 90s. Some of it stayed the same and the breaks gradually got replaced by individual samples, while keeping the rhythms approximately the same - relative to a 4/4 beat anyways. Eventually the name got shortened from breakbeat house to just breaks. Make sense?
At some point maybe most dubstep will turn into drumstep and the stuff that's left at 140 will start using halftime breakbeats or something. Some wag call the new style "dubs", the name will stick, and we'll have the reverse phenomenon. That would be typical.
Ok, I think I've pushed this off the trainspotter deep end at this point.