If I am a miner, I will support the soft fork and freeze the stolen funds. If the DAO holders offer us 50% of the stolen funds, we will do a hard fork.
If the miners can benefit from the hacking like this and the hacker does not benefit, he may think twice before his next hacking.
An attacker can short ETH as this one already has and walked away with 1-4 million USD. Therefore still has a strong incentive to attack all the many security holes and HF and blacklisting does nothing to stop this.
Perhaps one should focus on using secure block chains and not insecure ones ? Just some advice.