Name brands; Who will stay and who will go?

Now and days teens and young adults all wear hollister, american eagle, abrecrombie, hurley, volcom and thing of that nature. Obviously they haven't been around as long as say Calvin Kline or Levies. What new, youthful brands do you thing will stay around awhile and who do you thing will fade out in the new decade? And what do you think it takes to stay ahead in todays pop cultural clothing market?