It is somewhat of a nihilistic or fatalistic argument. But to me it serves as a counterpoint to the fear and depression that can take hold when considering the future of humanity and one's lack of control over it. It's meant to be comforting in a "don't sweat it too much, life will go on" kind of way.

I do sometimes feel like it's not worth worrying too much about what kind of earth your children's children's children's children will inherit. Just as all humans, they will enter the world as it is and make do. Their perspective and basis for what a "good life" is will be relative to their environment and experience.

I'm not saying we should burn it all down for the hell of it, but that I feel like there is a lot of hand wringing and pessimism about "the future" that is perhaps unnecessary and contributes to increased fear and anxiety (i.e. not the good life) among people that are actually alive right now.