Hmm yes, but what exactly is a neighbourhood in this context? Can an ant comprehend our neighbourhoods? Can it perceive or even conceive of them? It may be that we are looking in the wrong place entirely. What does another million years in the evolution of intelligence yield? What of the physics? Perhaps Dyson Structures are just what our limited imaginations can conjure of an advanced civilisation.

It's all a bit airy-fairy I know, but having come such a long way in a mere thousand years - I feel like the ideas we have of super-intelligent beings may be primitive.