Your question, Flobadob, refers only to our solar system, which comprises less than one billionth of the universe.
Simple probability suggests that there are billions of other life-bearing planets in the universe, and that many of them will have life-forms which are vastly more developed than us. i.e. someone on such a planet would see us in the same way that we see a single-celled micro-organism or, at the most, a bacterium.
Thousands of types of bacteria probably cease to exist on this planet every year. In terms of the universe as a whole, if a species called mankind also happened to die out, it would have no greater significance.