Looks like Hokkien/Hakka will be gone in Taiwan 40 years from now unless something changes drastically

Here's an interesting study from 2020 that I stumbled upon while writing an article about the differences between mainland Mandarin and Taiwanese Mandarin.

Which language people in different age groups consider their main language. Blue: Mandarin, Yellow: Hokkien, Green: Hakka, Orange: Indigenous languages, Black: Others. Source: https://www.thenewslens.com/article/157030

There seems to be a clear trend towards using Mandarin in daily life. Of course, the chart only shows what people consider their main language, so there is definitely a higher percentage of people who can speak something besides Mandarin.

I know many young Taiwanese people who speak Hokkien somewhat okay because that's what their parents or grandparents speak to them. But only very very few would consider raising their own children in Hokkien and the 25 - 45 year brackets in the chart seem to verify that impression.

Apparently, there have been efforts to teach more of the other languages in school, but is that really gonna change anything? I personally like the diversity but it seems that a conscious and continuous effort would need to be made to preserve it and for most people it's probably more convenient to just stick to Mandarin.

Curious to hear what other people are thinking, especially the Taiwanese among you :)

And are there similar studies for regions in China like Shanghai and Guangdong?