What do whites get out of diversity and multiculturalism besides being bred into extinction?
Developed asian countries like Japan, Korea have low birthrates too. But they do not commit further demographic suicide by populating it with alien cultures. They still manage to take part in globalization without destroying their ethnic majority. They do have issues. But it is the end of the world.
Even countries like Sweden had replacement level birthrates until 20 years ago. But still it became multicultural islamic hellhole.
So, it is not just the birthrate that is the problem here. There is something more going on.