Perhaps I'm misinformed, but I've gathered from what little I've read about events in 21st-century France that its ethnic-minority population is mostly Islamic. The presence of a large Muslim minority in a country like France is problematic because it is a basic tenet of their religion that society should be governed in accordance with Islamic law, which is fundamentally at odds with the Enlightenment ideals that underpin the government and laws of France and every other Western democracy. The hope that this problem will somehow be solved through intermarriage seems overly optimistic to me -- particularly if, as seems likely, the rate of reproduction among the non-Islamic French population is well below replacement level and that among the Islamic minority is substantially higher.