Board Thread:General Discussion/@comment-35312325-20180415084559/@comment-2A02:C7D:3691:4C00:ADB7:1DB5:F24:3A1-20180415191512

Not very. I would say something is "mainstream" when you can ask anyone if they know what it is and they can tell you. For example, if you went and asked a random person what anime was, they would most like reply with "Japanese/Asian animation" and have some understanding or an idea of what it is.

Whereas with vocaloid I have never met anyone who actually knows what it or knows more about it than just "Hatsune Miku". I bet there's a whole bunch of people who think she's a game or anime character. Overall, vocaloid is a niche within a niche. 🤔