This is almost correct.

>A society with prosperity but lacking family and reproductive pursuits will devolve into a crowd of purposeless humans living for the pleasures of the moment.

I would change this to

>A society with prosperity and whose universal revealed preference across all cultures is to use that prosperity to buy other crap that beats dealing with family and reproductive pursuits will devolve into a crowd of purposeless humans living for the pleasures of the moment.

I am all for family values, but I am not convinced it will guarantee purpose in life and prevent you from spiralling into depression for some other reason.

Indeed, few things are guaranteed.