If aliens would come and visit earth there could be options of their behavior.They could either be benevolent or the terminators of human species.But if they are kind as we do not imagine they would be , then there is a great possibility that the aliens would interbreed with humans.The offsprings could create the best and smartest generation of earth.This generation could be the conqueror of the universe,passing through wormholes and have the ability to go back to the past.This generation may not live in earth but its starts there.This extrasmart species could probably settle in other planets and be treated as gods.This generation might be the best among all species(though i am not sure with that)in the whole universe.But they could never be as great as god.