That's pretty annoying! Why do these scammers burn to hell, I was once a victim and this kind of news really intimidates me.
Those who stole bitcoins or any money, that money will never be helpful for them in the long run. In the short term, they may find themselves lucky but sooner or later nature takes revenge on them.
Even though the hackers have limited choices to move the funds but they have control over those bitcoins and as long as they are in control of these huge amount of funds, there is always the risk that they will dump one day or other.