Replace with new users? How do you go about doing that and why would they want that?
Social media users are notoriously fickle. If you have a vast, devoted community of longtime users, the last thing you want to do is drive them all away.
I think Reddit just got too entitled: forgot how much they rely on their users and figured they could get away with anything because they're just too indispensable to fail. It happens.
The value of Reddit to human society at large and the value it provides the corporate that owns it are not at all aligned. There’s a potential they negatively correlate, even. They need new people going through the gates to the Library of Alexandria, and the books are just means to it.