If anything, I believe that this issue is just a big unknown. Just like the possibility of fairly advanced human civilizations (a-la Atlantis) that existed in the far past and were wiped out by some catastrophe (or just moved out of Earth because it was too wasted at the time).
What is the possibility and probability of both events occurring? Who really knows or holds those answers? I'd like to think that technology as we know it is not exclusive of the "present" or the "future". Why wouldn't it exist (even more advanced than today) before OUR written history? Maybe there were no cavemen, or the cavemen existed millions of years ago and somewhere down the line of human evolution, technologically-advanced ancient civilizations existed (Egyptians or Mayans, anyone?) and perished. And our current civilizations had to start all over again.
What history tells us can't be too accurate. It only tells us the info that exists, and the info that exists is always one-sided.
Just some food for thought. And just as likely as alien civilizations existing alongside our own ancient ones.
What is the possibility and probability of both events occurring? Who really knows or holds those answers? I'd like to think that technology as we know it is not exclusive of the "present" or the "future". Why wouldn't it exist (even more advanced than today) before OUR written history? Maybe there were no cavemen, or the cavemen existed millions of years ago and somewhere down the line of human evolution, technologically-advanced ancient civilizations existed (Egyptians or Mayans, anyone?) and perished. And our current civilizations had to start all over again.
What history tells us can't be too accurate. It only tells us the info that exists, and the info that exists is always one-sided.
Just some food for thought. And just as likely as alien civilizations existing alongside our own ancient ones.