I'm sorry but no it's not. In order to preserve the human species from disappearing, there is no need that all the humans that are currently alive procreate. There is only the need that some of them do so. In the grand scheme of things, the number of humans alive on the planet doesn't need to grow indefinitely, it's not better or worse. There is just the need of enough humans currently living.
I'm someone who doesn't want to have kids. For multiple intricate complex reasons. And i'm fed up being told that my life is less valid, or less fullfilled, or I have less value than someone who procreates because that's the utimate goal of life and it is the only way to be complete (like it's the only way to platinum a life...).
I have friends who have kids. They got what they desire. They are happy. I'm happy for them. I like their kids, they're cool human beings and I'm interested in what they will become when growing up.
But, no, childless people can contribute equally to human society than others. I teach in a university, I think teaching useful skills to people is not an invalid way to contribute to the society. I have also other hobbies and activities and i've decided to fully invest my time in them. Sorry, but to say that i'm "less" a human than others because I don't have a kid, it's insulting. At least, i'm doing it by choice, but for the countless people who can't have kids, I think it's nauseating to think that way.
And please, spare me the argument like: "but if everyone were thinking like you and behaving like you, the human species will cease to exist, so my biologiccal argument is still a valid one!". No it's not, because it's an absurd hypothesis to begin with. In real life, this has a very low likelihood of happening. Never in the course of human history people will wake up and decide to not have kids anymore. So let the childless people remain childless people quietly and stop saying they will never achieve the ultimate goal of life.