I think it will be hard for bitcoin to go back to $600, bitcoin has gotten much support and won't go back to that such an amount, though it's my personal opinion.
Such a price is impossible to reach and anyone that is waiting for it is going to be extremely disappointed because we will never see it, but the decrease in the price of bitcoin has been so great that now you can get it for a very affordable price, so this is your chance to buy bitcoin, do not let it go like all of those people that sold their coins at 2000 waiting for the price to go down to 1000.