You are dealing with something that has no useful value other than speculators and miners trying to get money out of it.
No useful value.... I disagree strongly. In fact, I can think of very few things which are more useful than Bitcoin.
But, place your bets where you wish - with such confidence surely you are shorting the market? Or are you just talking? I encourage you to profit from your foresight. Bitcoinica will give you 5:1 margin for a short position... why not come back in a month and tell us how much money you've made?! I'll personally apologize to you for my skepticism of your reasoning.