You do not have to have a majority of people consuming something to be considered mainstream. TFA quotes 31-32% of people (young and old) in Japan as anime wat

You do not have to have a majority of people consuming something to be considered mainstream. TFA quotes 31-32% of people (young and old) in Japan as anime watchers. That is very mainstream! Your argument is like trying to claim Metallica is not mainstream. Sure, most people do not listen to them, but everyone has heard of them. I would wager back in the day less than 32% of people listened to Michael Jackson.