On Antinatalism Again, you're just presupposing that a 'good' economy keeps on going. That's absurd. What's better - an economy that keeps going for a million years but in which everyone is horribly poor, or an economy that lasts 100 years in which the majority of people are very well off?
Surely the latter. That's what stopping procreating would give us. And it isn't as if the absence of the economy would be bad for anyone - no-one would exist at that point, by hypothesis.
Consider: at the moment there are two massive groups who are unproductive and cost us all lots and lots and lots of money: children and the elderly. They produce nothing, and they cost a ton. They're supported by the largest group - the group in the middle. Us (assuming you're not elderly).
Now, if everyone stopped procreating, what would happen to the size of those groups? Well, one of them - the children - would rapidly reduce in size, as no more children are being produced and all of those that have been produced move into the productive central group - the one that produces all the money that the other two groups depend on.
Eventually the child group will disappear altogether, at which point we'll have a massive central group (for we are in that group the longest) and an elderly population. But that's better - that's a better situation economically than one in which you have the elderly AND the children.
Note too, all the time and money previously wasted on children can now be dedicated to the elderly. It is only the last generation that would have a problem - but, as I say, they'd know it was coming and could make provision.
Plus, it wouldn't be that bad. The real problem with being elderly is being elderly and that's something you have regardless of how many children there are around.