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Odds are that intelligent life capable of leaving indirect evidence of their existence is rare enough that temporal and spatial proximity are unlikely.
While the multiverse theories are interesting they really don't have much involvement in where the life is since none of the current theories allow for anything more than one way travel, just once, at the time of the local Big Bang.
Using conservative (but not extremely pessimistic) numbers in the Drake Equation suggests between 5 and 50 communicating civilizations in the galaxy at this time, so with the shortness of our search and its spottiness (making pretty narrow guesses on how we might expect to see communication/evidence) so not finding anything isn't a huge surprise to me unless it turns out the true Drake values are really huge.
So I'll just wait for the really good telescopes so that we can directly watch the aliens building their Dyson Spheres.
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