1000 generations into the future? People to whose genome you contributed 2^-1000, i.e. almost nothing? Who know neither your name nor care about it? Like you don't really care about your ancestors 1000 generations ago? Or 100,000 generations?

I don't get it.

Basically: Let's face it, when we're dead then we're dead. That's it. You have your life. Trying to achieve some sort of immortality or higher purpose by creating offspring is just as futile as praying or paying some quack to help you with afterlife matters.