Genocidal ideas are more common than we like to admit.

I mean, there are only two ways this can go:

1. Humanity's population decreases (voluntarily or otherwise)

2. We figure out how to get humans off of this one specific oblate spheroid we call "Earth"

Personally, I'd much rather see Option #2 happen, but given how unwilling we seem to be as a species to pursue that branch, #1 seems to be inevitable.

Let's just be honest about what we are doing.

Genocide is the intentional killing of large numbers of people. Failing to procreate isn’t that.

Denying procreation is a genocide as well. E.g. sterilisation of a large number of people would be a genocide.

Says who? “A pyramid unfinished” indeed.