And so this is where Hawking leaves us, pondering our fascination with broadcasting our presence into space. Wouldn't it just be better for us to stay as quiet as we can, listening rather than shouting from the rooftops?
Personally, I think Hawking has a point. Although it might take hundreds, thousands or even millions of years for our signal to reach an intelligent "ear," if that ear isn't a friendly one, we've basically decided our future-Earth's fate.
If there are any human decedents beginning to spread beyond our planet, it would be a real downer for an aggressive alien invasion to suddenly appear in response to our ancient transmissions. I'm sure we'd look back at our idiotic past-selves with anger when we realize we are living in the backyard of a vastly superior alien race intent on eradicating the human infestation that's spreading down their garden path.
On the other hand, we might contact a race of "huggy" aliens who genuinely want to be our friends. But on the off chance that we might get eaten, I'm with Stephen Hawking. Let's be careful about how we advertise ourselves, shall we?