When considering the probability of Earthlike planets and life elsewhere in the universe, most probabilistic estimates (for example, the famous Drake equation) tend only to focus on alien civilisations we might potentially be able to contact.

Working outside our light cone and assuming that our civilisation will survive indefinitely into the future provides much more opportunity, of course. The universe is likely to last a very very long time, and even ~13 billion years in we're still only a small fraction into the universe's projected lifespan.

The longer we look and the more data we gather about the universe around us, the more it's becoming clear that we're not really very special - just another rocky planet amongst an almost uncountable number of others just like it. Even with the smallest odds of life arising on an Earthlike planet, life may be very common after all.