Within 25-50 years there will be no Western Civilization. Even Russia is being invaded.
Russia is not part of the "Western" Civilisation -- it, along with a lot of Eastern Europe is part of the Slavic/Orthodox civilisation. "Western" Civilisation started to decline when it broke away from the Catholic Church. The Catholic Church will continue as it still remains in the hearts of Europeans, Americans, Asians, Africans etc. Perhaps a decadent post-Christian civilisation will disappear but the Christian Civilisation (that includes Russia, Latin America, Central America, Asia, Europe, Africa etc.) will remain.