thanks Nicole — a fascinating topic. I first traveled to China in Summer of 1997, just when Hong Kong was reunited with the Mainland. Shortly after that, I moved to Taiwan for a few years to learn Mandarin.
The local Taiwanese dialect ( 閩南 or 台語) was also under threat during the several years of KMT rule & martial law, but in the past two decades is making a strong comeback, language classes are offered and printed literature has gained popularity, and of course the older generations naturally enjoy speaking it and are keeping the oral tradition alive.
I would be curious what similarities you see in the status & roles of Cantonese & Catalan.
Finally, since you say that you enjoy sarcasm, and are interested in the Catalan region, I hope you will enjoy this: