From what I gather this is how things look. Correct me if I'm wrong:
1. "Brostep" appropriates dubstep sounds for a younger American audience, calls itself dubstep, alienates some listeners of dubstep proper.
2. "Trap" appropriates Southern trap sounds for a whiter American audience, calls itself trap, alienates some listeners of trap proper.
3. People who once made dubstep proper go on a reactionary mission to distance themselves from brostep, crossbreeding the old sound with all manner of genres. The sound gets more and more tasteful to the point where everything sounds like house music.
4. People who once made trap proper continue to make it, never really taking new trap seriously in the first place, if they were ever even aware of it.
5. Some people in Manchester (or wherever. "the north") re-purpose formulaic big club electro house sounds, make the bass lines sound a little more like they have something to do with UK garage, so gets weirdly argued by some people as being the most original sound amongst a heap of unoriginal sounds.
6. Justin Timberlake puts out another pretty good record.
I'm off to listen to black metal for a year.