Apparently it's already a widespread business and The Guardian published this article about it. It's an amazing, at times heart-breaking story about what people need, and in a way it's only tangentially about porn:
https://www.theguardian.com/culture/2017/jul/29/jon-ronson-b...
(It's not at all a catalog of fetishes, in case that's what you expect/want/fear.)
https://en.wikipedia.org/wiki/Voluntary_Human_Extinction_Mov...
Of course if a physical solution to ending existence without introducing a lot of suffering can be found, even better.
What you are saying is one of the two only noble options we really should consider though.
Oddly my comment is being downvoted. Most HNers act like a quasi religious group.
> Most HNers act like a quasi religious group.
That is a pretty broad brush.