I'm surprised an option for changing bitcoin hashing algorithm was not envisaged in the original concept. Everything that is man-made can be destroyed or counterfeited by another man. This is why everything valuable for the society should have built-in mechanisms for defence and protection improvements in case it is needed.
False. Knowledge based on formal logic can't be destroyed. Theorems for instance. However, it would be more appropriate to describe them as being man-discovered rather than man-made.