Howard I can't imagine anyone flaming you for the mention of Gould and his rather prolific works. This is actually a very appropriate thing to consider when we are speaking of a species that may become extinct.
Others of prominence have also argued that extinction of any species, including the human race, may be part of the natural order of things.
I'll throw this out there for it's philosophical value and it is not intended to be a reference to religion, any religion.
The original Buddha was reported to have said the following: We all have 23 problems of which the nature of these problems we can do nothing about. Should we somehow find a way to solve one of our individual 23 problems it will in short order be replaced by a new problem and again we will all have 23 problems. Only now the new, replacement problem, may be worse then the problem that we somehow solved........
It is also recorded that he went on to say: If you do not believe me then you my friends now have 24 problems........
So does interfering with the natural order of things, history, create new and potentially worse problems? Perhaps. Perhaps not.
Does the human race as a species and the foot print that we leave on this planet qualify as the natural order of things? I don't know but I am practicing treading water and hope to see you on the boat Howard. I am an excellent sailor....