Whether we "need" humans depends on where one's values are; for those who would like humans in some form to continue to exist, the idea of AGI making humans obsolete isn't terribly comforting. Even those who might really like the idea of humans sort of evolving into AI (and eventually ceasing to biologically exist) might not be keen to rush toward human obsolescence if they're not thrilled with initial versions of AGI (diversity and optionality is nice).
Whether we "need" humans depends on where one's values are; for those who would like humans in some form to continue to exist, the idea of AGI making humans obsolete isn't terribly comforting. Even those who might really like the idea of humans sort of evolving into AI (and eventually ceasing to biologically exist) might not be keen to rush toward human obsolescence if they're not thrilled with initial versions of AGI (diversity and optionality is nice).