Let's have a look at the comparison of UEFA coefficients among top leagues.
France is really way behind top four teams as you can see. Even though the market value of the Ligue 1 (€3.67bn) is nearly three times the value of Eredivisie (€1.26bn) even Netherlands is so close to overtaking France in this rankings. The popularity of the Ligue 1 is also not higher than the past either. It is even going the opposite way while the competition level isn't at a satisfying level due to various reasons. Do you think they would do something to turn things the other way around?
What can they do? Find a second group of sheikhs for PSG-2 to appear? Football is a business, the best conditions for business are in England and as we see this is directly reflected in the results. As far as I know, in France, because of taxes, things are much more sad with this and football there as a business is unattractive (PSG is not a business project but a toy in the hands of the sheikhs).
By the way, I'm surprised that things in Italy are not so bad, I heard that they are in decline economically.
Like you said the best conditions are in England. It isn't because of their being a special country from the beginning. It is a result of their high effort to offer the best conditions. Is France doing the same? Unfortunately not.
I mean they don't need to be like England. But they can at least get close to other top countries' level. You mentioned one of the reasons for France for example. They can work on making some improvements to attract more investors. But if this isn't fitting the government policies then we would continue to see France football behind the others. I don't know maybe they are already happy with their position and I'm just discussing it for nothing.