So basically in 50 years Cantonese will largely live on in its disapora, much like the forms of Sicillian and Napolitano and the hundreds of other endagered languages you can find in NYC
Yes. But there is a different. Between Natural Selection of language where it is gone and a planned deliberate attack to get rid of the language. Correct me if I am wrong I believe Sicillian and Napolitano are the former. Cantonese are the latter.
I mean, Southern Italians from Calabria and Sicily fled Italy precisely to escape what they perceived as an attack on their culture and society by Northern Italy, given the official government told everybody "you and your children will now be speaking Tuscan from now on, oh, and we're gonna fuck you with high taxes" (Tuscan, the regional language of Tuscany, was promoted to Official Italian by the Nationalist government). This schism between north and south still exists to this day in Italy (it even gets mentioned in The Sopranos!).
Perhaps the difference is one of degree rather than an absolute difference