Still, these are not bad odds for finding someone else out there in the galaxy.
I would further argue that alien civilizations orbiting a sunlike star are more likely to pursue interstellar colonization because of the comparatively short lifespan of their home star. And extraterrestrials living in binary systems (like Alpha Centauri) would further be motivated to pursue space-faring because they want to explore inhabitable planets orbiting the companion star.
ANALYSIS: Alien 'Star Engine' Detectable in Exoplanet Data?
Alternatively, aliens may chose to slowly move their home world into a wider orbit that backs off from a heating-up star. This requires no more science that a straightforward application of Newtonian mechanics. Newly forming stars are dynamically shuffling planets around all the time.
Therefore, the future is not so dour if we plan on either moving Earth to a cooler place in space, or leaving our home world behind to colonize another star.
Image credits: iStockPhoto, NASA