Whites are also being killed off by government elites who are waging a propaganda war to convince whites that there are are no meaningful racial differences between different races and even that race doesn't exist. Those whites who resist the genocide are labeled racists, bigots and haters in an attempt to isolate them from other whites and to have their message or survival ignored. America and most formerly white nations have entered a Post-white stage of existence. The prospects for the survival of whites as a people are gloomier now than they have ever been in history. Genocide is a reality.
Extinction is a very real possibility.
Mainly, it is whites themselves. White people, as a group, have lost the will to survive. In fact, they don't even see their extinction as not surviving because most are now so propagandized that they are blind to the fact that they are even a distinct people at all. Not seeing themselves as a distinct people, they view all people as fungible. Remove all those white people from London and replace them with non-white people and these low consciousness whites, who do not see themselves as part of a distinct people, figure it'll just be the same.