They have. They've decided that importing the entire third world into the West is the only solution. The West as we've known it for 2000 years won't make it past 2100 due to this demographic shift. There is no turning back, there is no undoing what has been done. Europeans and White people are the only shrinking demographic in their home countries.
Wonder what the Native Americans think about the “West” they knew for 2,000 years. Or anyone who has read the history of the Americas would know.
Countries, ethnicities and national boundaries shift with the times, ease of migration and economic trends. The world has 7.9 billion people in it, so the fate of the “whites” as a race is of little concern to humanity…
People have been sounding the call of '[People who look different] are coming! Our culture is doomed!' for mellennia, and thankfully we learn not to cares what they think. We will keep progressing and leave them to stew in their ignorance and spite. For more than 2000 years people complained about the barbarians invading, but once we learn to ignore the shrill cries of alarm we look around and the barbarians are nowhere to be seen, just a bunch of new citizens with interesting new ideas.