It Won't be Easy and It's Not Because We Are Dumb
We all discuss and argue about everything continuously, mostly without ever achieving a great deal - the media are a personification of this; in reality things actually get done in spite of all the waffle and as a result of the evolutionary process of adaptation to prevailing condition, the condition of existence. We, as humans, can and do influence this process but cannot pre-determine its outcome.
It is not because we are dumb (stupid) but our thinking is inevitably prone to significant error because we are never in possession of all the facts and even if we were, actually an impossibility, we would never be able to process all the information correctly. This is fundamentally due to the inherent nature of our interface with reality that is inescapably based on a process of interpretation of representative sensation.
Bruce Schneier is right to the extent that the situation is dire and he is right in trying to promote awareness of the problem but unfortunately the exponential nature of the advance in knowledge, information and technology, all key components in the wholeness of existence, means that it is beyond the capabilities of living entities to structure an appropriate and effective plan for its future control and the security that it requires.
The future is becoming increasing rapidly (exponentially) less predictable and progressively more uncertain. A reality that increasing diminishes our ability to constructively influence the future, the process of evolution. Oh, dear!!