Why would something "change" because "developed rich countries" hurt? Why wouldn't those leaders just roll with it and see it as inevitable, or a purification of their degenerate populations, or just another day in the end times, or whatever?

I expect "change" when people form unions or union like organisations and withhold or redistribute their labour, both waged and in more subtle forms, such as attention, and unwaged but socially important labour (e.g. women refusing to be servile homemakers and instead get guns and start soup kitchens).