Too pessimistic. One can't really know for sure, not yet anyway, but the "odds" seem better than that. It's 100% certain that the chemical components for life abound. So if those materials find themselves in the proper environment (planet with an earth-like orbit, liquid water, etc.) it would seem almost inevitable that some kind of life would pop up: bacteria, algae ... something. And that's just for planet-based life. All kinds of funky stuff awaits us on comets, asteroids, and perhaps other environments. It's a fairly safe bet either way, because none of us will be around when a definitive answer comes in, but my bet is that there's life virtually everywhere it can get a toe-hold (or pseudopod-hold).