“Um, you might want to pay closer attention to what Hawking is presenting through his new Discover Channel progam. In discussing worm holes and black holes and time travel, Stephen addresses these issues from the only perspective he can afford to entertain, fromt he extreme vast ‘linear time’ distances between points in the universe where intelligent life and technologies may arise.”
The hypothesis/dependence on the existence of wormholes does not increase the already impossibly remote odds of any contact with an alien species - assuming they even exist.
Sure, speculate all you want, but to draw conclusions from the speculation like “we shouldn’t talk to aliens” is comically juvenile “rock-star” science.
Inter stellar travel will be an enormously complex and hugely expensive undertaking, for any civilization, even one a million years ahead of our tech level.
What if the civilization under consideration has gone beyond economy as we think of it, to have a total collectivist civilization? To such a race(s), our constantly conflicted species fighting over resources and property rights and power would be like a virus the aliens had cured in themselves, so our very existence would be a threat to their civilization should they choose to re-infect themselves by having regular contact with us.
What if the civilization is not a total collective? In such a case it is not difficult to imagine that only the elite, the most powerful have control over the interstellar travel. Would our primitive civilization hold any value for such an advanced and 'capitalist' regime of stellar power? Not likely more than a curiosity.
And so it goes, thinking about what may be the 'other' intelligences in the galaxy. ... And we didn't even touch upon the 'other' extraterrestrial beings spoken of in the Bible, such as in the fifth chapter of Daniel or Ezekiel's wheels within wheels story.