[yongjik]

> there is a long list of long-dead languages that attests to this.

Look up Ainu and Okinawan languages - Japanese is the dominant language that drove its neighbors' cultures to extinct. It has more native speakers than French, German, or Italian. The Japanese culture is not going anywhere.

Most of the time, those "globalization is ruining beautiful Japanese culture" arguments sound like a mixture of orientalism and xenophobic dog-whistle, i.e., "Isn't it nice that there's a country where only its one native ethnic group is considered the true members and all else are at best second-class citizens?"