The franchise should appeal to other demographics other than the ones that are currently enjoying it to broaden its portfolio and horizons, but not at their expense.
No. Utterly wrong. A translation of this is “People should make stuff for others to enjoy but only as long as I get to enjoy it too.” Not everything is about you, not every show is going to be made to your tastes. Get over it and just don’t watch it. Just because it isn’t made for you or your demographic doesn’t mean that it isn’t worth making. Other people exist.