Let's say mankind never goes extinct..
We create incredible technology and can alter our DNA anyway we like, becoming super-intelligent.
What's the point of lifeforms? Say we get the power to reshape matter and energy itself becoming a near-godlike entity. What's the point of that lifeform?
It seems to me all life on Earth might as well have gone extinct in the Stone Age for all the point life has but then I'm in a foul mood.
"Need" is just a fiction. As is "should", "must", "value" and "importance".