Bitcoin cash will have the same features as bitcoin so it will be bought for the same purpose - sending money / trading alts - if either of those are wanted from anyone in the world at any point in time you have a buyer, thus a dump. No one has to believe people are giving money away, for free was just not needed, because they do hundreds of millions everyday to the new ICO , pan handler on the corner, or Youtubers via some dumb tip button.