The probability of humanity continuing to exist forever may be 0. But I hope we last more than a few more decades or centuries. And when we are gone, it would be great if could make sure that our descendants carry forth the stuff we (when it happens) consider the most valuable aspects of humanity.

Whether that's the ability to create and appreciate art, beauty or the ability to experience emotions such as love and purpose, or maybe some abstraction, generalization or expansion of these that we may not comprehend.