I believe that study is way too liberal in it's projected time for whites to become a minority in their own country...
From simple personal cross-country observation, I expect that whites will be a minority group within two more years, if they are not so already!
The reason that "academicians" always state in their conclusions that the "gathering storm" of racial imbalance and its consequential shift of political power is "many years away" is so that the white population will be deceived into believing that "there is no immediate threat", and that therefore "they should pay no heed to the naysayers."
The same type foolishness exists in Israel, where Olmert & his liars claim that "unless Israel immediately gives up all the Land to the PLO Nazis and creates a "Fakestinian" State, the demographic shift resulting from the Arab birthrate will produce an Arab majority within the borders of Israel within ten to twenty years.
This is an outright lie and deception, for the facts show that Arabs are already a majority in the Galilee and their numbers are growing larger each day.
The Israeli establishment scoundrels are living in denial, because returning the Jews to the pre-1948 borders not only does nothing to prevent the ('Israeli') Arab population from becoming the majority voting electorate, but will threaten the Jewish State with millions of maniacal bloodthirsty Muslim savages, both outside its borders and also from within!
Conclusion: Kahane was RIGHT!