I'm not sure about the extinct comment.... it's seems logical to me that they will be phased out. Also mutations are phased out when there is no longer a use for them. light skin is an unnecessary adaption in northern climates these days. Other than socially in racist climates.. there is no benefit to light skin.
About them being nervous about their culture being in jeopardy.......It's ironic on so many levels that they are the ones concerned about that. To their credit. they have done a great job of building on the knowledge of others and suppressing the culture of others to maintain a superior position in the world. I feel like the world will benefit from those advancements once whites are gone.. hopefully their internal natures go with them.
Hopefully the understanding that not every so called advancement is good for the human race will replace extremely aggressive imperialism... and an emphasis will be placed back on real culture and real advancement.
In like 160 years, inbreeding in KY produced Blue people. Blue skinned people because of some disorder. It doesn't take too long to wipe out white people, especially with the majority of white woman on Earth being attracted to darker men. I've been to these European nations and... it's frankly sick how they look at black men in some of them. America is mixing pot... I don't have a BMom's that isn't mixed (Irish, white cuban, etc.) , even tho they identify as black.
All the things that define white people are recessive, including the overall manipulating personalities. That manipulation and blue eyes are recessive things that decrease every 10 years. When a subspecies or particular group is feeling threaten, (geographically, or genetically) it's only natural to be concerned (IMO) The topic of this thread is expected. I don't know how I would feel if black people only showed up on earth a few thousand years ago and I knew that we would be gone in less than 10k years. We naturally like ourselves, and our people, so it's natural to be concerned about something like that... so I understand the mentality of some white people in wanting to preserve themselves and their devilish natures.
In less than 200 years the Earth will look like Brazil. After that it will be darker, but without that many very dark people. The only way to prevent that is isolation and controlling immigration. The cultures and religions of all these immigrants infuses with these European nations and changes the entire landscape in less than 10 years... so of course they would want to protect themselves from that.