Actually only half of the 600,000 Jews in France are considered 'monied', assuming that they can sell their their villas
and get their money out of the Societe Generale bank. The Socialist French government may not allow a flight of capital out of the country.
The other half of French Jews have little money and would require as much initial State absorption, housing, financial and medical assistance as a poor Russian, American or Ethiopian immigrant: c $100,000 each over 3 years.
13,000 French Jews are currently actively requesting Aliyah, with another 30,000 likely.
Not every French Jew can afford to live in a Netanya penthouse
http://www.ynetnews.com/articles/0,7340,L-4616093,00.html
Should there be another attack, that could become 100,000-600,000 in one go, at which point the Israelis would likely install yearly quotas like they did on the Falash Mura, on grounds that "the State can take in immigrants at a rate that it cannot absorb"
The very last type of immigrant the current Israeli Establishment wants at the moment would be a sudden surge of 1-10 million spoilt, loud, uninhibited, untrained, skilless, unmonied, demanding, ignorant, poor, slack-jawed, gum-chewing, overweight, gormless US Jews, half-Jews and quarter Jews. I am convinced that they wouldn't be allowed in
at all under the Israeli current regime!
This could be the beginning of the "Ingathering of the Exiles" - "a day greater than the Creation of the Heaven and Earth" (Talmud) - but does Hashem want quantity or quality in His Land?!
"There will be only 7000 Jews alive in the Land of Israel to greet the Moshiach" (Chesed l'Avraham 3:22).
Don't forget that although 30,000 Jews arrive on Aliya each year, 56,000 native Sabras flee Israel each year ie there is a net Yerida of 26,000, most of them fleeing to.........
Paris! There is a potential 1-2 million Israelis worldwide who could also suddenly want to flee back to Israel. The West Bank is going to be needed as.......Jewish
LEBENSRAUM!