It fell quite strong again yesterday, because some guy offered 26000 BTC at once ($300 each), (it might be a tactic to make them cheaper as well as a real dump.)
personally I will keep investing in them, as I don't think they will fall much lower than what they are now, especially as more and more big companies get involved.
I see very little downsides to the Bitcoin system (especially when it stabilizes in the future)