I think it is myopic to blame the audience in this regard. I remember what Manoj Bajpayee said when he was asked this question in an interview and I think it is the best take in the whole debate. Here's the quote from the interview:
When asked if the viewers are also to be blamed for patronising a certain section of actors following a line of nepotism. Manoj said, “We will come to that definitely when the time is right. At this time, the right questions are being asked. I agree there is a lot of chaos and filth but if you want to find the questions you want to find the answers for yourself, then you will realise that the solution lies in us. The audience does that but it’s not their fault. Look at the manner in which good films are exhibited and distributed. They don't get the right number of theatres, they don't get the right number of shows, right timing of shows. When a small film starts picking up, it's taken off. Are you giving that audience a chance to go ahead and mentor those films? But yes you are right, a little bit of a problem also lies on that side. We will come to it. First we will have to rectify ourselves, only then we can ask those questions to the viewers. Otherwise, it will sound whataboutery.”
Full interview was posted here: https://www.indiaforums.com/forum/bollywood/5166465/manoj-bajpayee-bollywood-must-rectify-its-mistake
If I am not wrong, the crux of the issue is the monopoly at play here. Audience tastes' are evolving as they become more exposed to international cinema, otherwise Salman's films would still be ATBBs.
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