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I'll bet we find microbial life somewhere in the solar system within the next few decades. But any intelligent life is probably so far away that we'll never cross paths with it.
Barring some circumvention of the known facts of physics, this is 100% it. The evidence of intelligent life here has (at best) been broadcast for about 120 years, so assuming an ET civ with a travel speed of exactly 1c, the only responders would be within about 60LY.
That's assuming early 1900's spark-gap radios had enough juice to overcome the inverse-square law to be heard that far out. And for practical concerns we can assume a travel velocity of even less than 1c. If they're out there, they either haven't heard us or won't get here soon.
So it's a beautiful photo, but at the end of the day any further considerations for the implications of ET civilization is just mental masturbation.
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