What if we, humanity as a whole, are the Forerunners? What if we are just at a really early stage in our evolution process and we will be able to travel through space using "slip space" technology? I honestly believe that our obsession with the science fiction universe will propel us into a futuristic age that closely resembles the ones in Halo or Star Wars. What if we are the ones that are meant to aid the rest of the universe with our technology in the (not too distant) future?
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We are the descendants of the Forerunners, thus the Sangheli stopped killing us and turned against the Covenant.