Didn't you know?
We're already obsolete.
There's a procedure that strips the cell body from an egg cell and replaces it with an enzyme that causes it to be recognized as a sperm by another egg cell.
Yes, you got it, this means that two women could combine genetic material to produce a child (always female, as well) who was as much a child of both of them as a naturally-born child would be.
The only reason this procedure hasn't gotten more publicity is that the men have kept the funding from going to human trials. They use it occasionally in livestock.