The jury is out for a while on whether the result was "survived" or "gave a better playbook for next time". Those on the left would tend to argue the lack of consequences thus far encourages a more competent attempt.
I'm confident that the people in the system have woken up to the fact that a large scale attack can come from within the system, which was previously unthinkable, and adjustments will be made to help prevent it from occurring again.