Yes but although I have never been to South America, I feel like the fans can contribute a lot to their teams' successes. I know that this didn't work out very well in 2014 against Germany, but still the crowds are amazing there. But I still think that even in three years from now France is probably still the dominating force in world soccer. It is unbelievable how many young outstanding talents are spread all over European soccer. England and Spain also have quite a few, but France is all set for several years to go.
France is the same team that failed to qualify for the 1990 and 1994 editions of the FIFA World Cup. Their recent success has a lot to do with the migrant origin players. France has a very large immigrant population (10-15 million) and that gives them a bigger advantage when compared to other European teams like Spain and Germany. Also, Ligue 1 has emerged as one of the top European leagues, partly due to huge amounts of money being spent by teams like Paris Saint-Germain and Olympique de Marseille, which has allowed them to recruit top players from all around the world.
I would agree upon your idea about Paris Saint-Germain and Olympique de Marseille, spending huge amount of money to compete with teams like Bayern Munich or Real Madrid and such. In past like 10 or 15 years ago French teams were lot behind of Spanish and English. I am not sure immigrants helped French a lot in that sense tho. I mean how do we define immigrant? There are many people currently living in France because their origin nations were colonized by French. Most of those kids grew up like French people, they probably didn't even know how life is in Algeria or Cameroon etc. I think French national team is better because they found golden generation suddenly which Spanish had and lost. Its bit lucky for them.