One thing I will say is thay with this much money involved and the value continuing to rise, there is a HUGE incentive for people to try and find a way to do an attack.  Since it is web based anyone in the world can try to attempt this.  Think of all the mafia groups all over the world. 

I do not fully understand the way bitcoin works enough to say if it is possible or not but it is certainly something we should all think about.

It would be nice if this could be a constructive discussion instead of resorting to name calling.