I don't see why you say that french BD follow the same fate as some of the other things you talk about.

From personal experience, growing up in India we always had either Astérix or Tintin to read. Even some of the lesser known works such as those by Giroud were available.

Now that I have been living and working in France for 6 years, one possible reason for this lack of penetration of french products is the language. There is very little effort to actually make the products accessible to the world at large. Now we may discuss the merits and demerits of this but the fact remains that if we want our products to be known all over the world, we have to make it known to the world. And most of the world speaks English.

Mes deux centimes.