It's true in many animal species including humans: large, secure populations feel less desire to reproduce. Within human population this is easily observed in a few ways, such as which societies have lower birth rates and which ones are more tolerant of non-reproducing folk. This is just another aspect of that. It's less "yay sunshine!" than increased gay rights, and I understand some of the misgivings one might have about some people missing out on what is often seen as a key part of the human experience, but it is still part of an overall good thing.
