without being familiar with the linguistic landscape in France that sounds like a fair comparison. contrary to what a lot of Western chauvinists love to claim, linguistic diversity is quite celebrated in China. One such example I am familiar with is the effort to try and revitalise 上海话 in the last decade or so. Although of course I’m sure there has been erosion of some dialects as well, an unfortunate aspect of nation building, increasing education, and creating economic opportunity for people throughout the nation is that some small dialects will become less useful for younger generations with internal migration and so forth.