All we can do is speculate. As it is, the Traveler seems to be in a form of hibernation wrought upon it from its previou expenditure of energy to keep humanity safe. Despite its efforts or thanks to them, rather, humanity still retains a single city. The Traveler need not communicate when we attribute it for the powers it grants us. Through this "Space Magic" I assume the Traveler is granting us the means to make our own "Destiny" if you will with the energy it has left rather than launching itself into its previously active state that would result in its destruction given its current energy levels. Regardless, this all speculation. Only the game can reveal the truth.