Yet Another "Axiom" Question

[David Sklansky]

And again what I mean by that is a question that will shed light on how you approach many questions. And a question that can't really be debated logically.

Suppose there was some scientific procedure that could be implemented that would make everyone on Earth far happier, richer, fulfilled, pleasant, smart, and whatever other adjectives you think are important. There is only one downside.

500 years from now all humans will become sterile. Nor can they be cloned. Humanity ends about 100 years later. Should the procedure be done? If yes, how much smaller than 500 would you accept? If no, how much greater than 500 would be OK? Also if you answered no only because you think God would be angry, what would your answer be if he assured you he wouldn't be?