"Also (to the parent poster,) I just see the possibility that a migration like this could take place within 25 years just ludicrous." Why is such a time-frame

"Also (to the parent poster,) I just see the possibility that a migration like this could take place within 25 years just ludicrous." Why is such a time-frame for this kind of a transition so ludicrous? In 1989 cell-phones were uncommon and looked like this: http://phoneevolution.files.wordpress.com/2013/03/1.jpg http://phoneevolution.files.wordpress.com/2013/03/1.jpg. In 1899 there were about ~8,000 automobiles in the United States [1]. In 1924 Ford was producing over 2M Model T's per year [2]. In 1903 we saw the powered flight of a heavier-than-air aircraft by the Wright brothers. In 1927 somebody flew an airplane across the Atlantic ocean. [3] [1] http://web.bryant.edu/~ehu/h364/materials/cars/cars%20_19th.htm http://web.bryant.edu/~ehu/h364/materials/cars/cars%20_19th.... [2] http://web.bryant.edu/~ehu/h364/materials/cars/cars%20_30.htm http://web.bryant.edu/~ehu/h364/materials/cars/cars%20_30.ht... [3] http://www.loc.gov/exhibits/treasures/wb-timeline.html#1903 http://www.loc.gov/exhibits/treasures/wb-timeline.html#1903