Hijacked? What on Earth do you mean? If you mean, has it as a genre sold out, I don't think that's possible unless a part of the genre is rejecting capitalism and the mainstream. Yes, you can buy steampunk patterns from Simplicity (and when we figure out how to adapt that jacket around my scoliosis, I am going to have a fabulous outfit!), and yes, you can buy cheap steampunk jewelry at Fuego, but so what?
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"