well the fate of the human race is far from certain considering we haven't faced any major threat to our survival ie asteroid/comet impact, cosmic ray burst etc the universe has been around for billions of years and to say we are ahead of the game is a bit premature. there could be several reasons why we haven't seen any intelligent
Fermi paradox - Wikipedia, the free encyclopedia...
or maybe they don't exist
Fermi paradox - Wikipedia, the free encyclopedia...

this is all based on fermi's paradox, which is based on what we are talking about right now. this article can explain it better and in more detail then i can
Fermi paradox - Wikipedia, the free encyclopedia