This can be said to be really devastating and it goes a long to prove that the blockchain network is not infallible as it's being portrayed since the beginning of time but now a flaw has been identified. It was blocked now but what happens if the attack becomes so consistent that it can not be wandered off and that would be so devastating to the entire crypto industry which could bring an end to further development that could happen on the blockchain platform
We really can't say that we have unshakeable network because it is only a matter of time, when someone can penetrate again the system. But we still have white hackers or good developers that can counter-attack these malicious activities. They won't let our network die because of these people. But we need to prepare for the worst, right?