It's self-destructive as a human to want the human race to be eliminated, whether it is within your lifetime. Regardless of whether you want yourself to die, your self is still human, so to wish the extinction of all humans means to wish the extinction of your lineage, your continued heritage.
I am implying that all humans are connected, as we all obviously come from one another lol, so for any human to wish the extinction of our species I think is self-destructive. I am not placing you with everything, I am placing every human with all humans.
So yes I'm being somewhat metaphorical as I am saying self-destructive in the sense that our selves are all human, and as you do not wish yourself to die, but you want what your self is, human, to die off. It's a valid metaphor to say that a human wanting the extinction of humanity is self-destructive.
I just thought how similar this is to Michael Alig's character in the movie Party Monster saying he always thought he was self-destructive, even for being gay as he wouldn't have children and perpetuate his lineage. Without perpetuating your lineage you do not live on. I'm not homophobic but not having children is opposite of how nature perpetuates. I repeat I am not homophobic, but if he every human was gay it would be self-destructive in the sense that humans, as in who your self is, would not perpetuate. Just as wanting all humans to be extinct means that what your self is, human, would no longer perpetuate.
I'm not saying what humans do isn't self-destructive. I think we all know that we need to change. I, however put faith in the ingenuity and intelligence of the human mind and I do believe we will continue to evolve rather than wanting us to continue on our path of self-destruction as you seem to subscribe to. Why would you want us to self-destruct rather than use our minds to make the world a better place? You specifically say you want us to self-destruct, rather than saying you want us to progress. I would hope everyone would want us to evolve. Wanting us to self-destruct in 500 years, is self-destructive!
Don't be so cynical! I think you should recognize the gift of our intelligence and have some hope for humanity rather than wanting our species to die off!