If you voluntarily leave they don't owe you severance. Its in their best interest to get people to quit vs firing them.

>None of the Millenial stars have been replaced by copies.

This is for a number of reasons.

a) the next generation is more diverse in terms of musical choices so there aren't huge all encompassing acts that can speak for entire swathes of a particular generation. This is actually a good thing because there is more musical choice for listeners as well as artists have more freedom to explore different sounds rather than try and fit an industry template. Thats why you see more mixing of genres today, if you do listen to a lot of artist interviews from the 90s, 2000s a common theme is that when they wanted to take a risk and try to go a different way than the "industry trend" the labels would push back a lot and sometimes hold their contract over their head so that the artist would do what they were told.

b) the metrics have changed, due to different ways of consumption If an artist songs are huge on a platform like tiktok or soundcloud none of the traditional music metrics actually captures that

c) the fact that younger people are using different form of media also affects the coverage of those artists in traditional media. Why would a top 40 station play music geared to 15-19 year olds when hardly any of them listen to radio.

If you are heavily reliant on getting your music from traditional forms of media you aren't really going to see any of the newer acts coming up.