I would like to think that such low price will be almost impossible to see again, but I am also aware that in these current volatile conditions almost everything is possible and there would be needed several adverse, but not unlikely scenarios to return to that levels.
I think it is still possible for the price to go lower than $400, you are right, because of volatility.. But if it goes that low, I think it will just bounce back to its price above $500 in short time...Lets just hope that price right now would go on for a little long and won't slip or if it fall drastically, for sure there is a big reason...
no it is not possible to go below $400 anymore. it seems like you are forgetting the history. let me remind you of what happened before.
http://www.coindesk.com/price/#2015-10-15,2016-07-17,close,bpi,USDbitcoin price reached $400, 9 months ago and it became stable above $400 in about 1 month of volatility. now here is the important part:
nothing could decrees the price majorly, even the Hearn FUD about bitcoin could only break the $400 resistance for about a short week.
now do you really think anything can be strong enough to cause such a dump in bitcoin to go down $250 first and break the resistance that nobody could break before!!!
besides the $600 is the same resistance just like $400 in early 2016