There has always been genres that dominated the cinema at some time.That's partially correct, but I think you'll find the weak stories and over diversifying of content has been the most problem to films. I don't think the audience minds a reasonable amount of diversity in films, but to over saturate has been an issue and, as I say, the poor baseline to stories just to get them out has stopped audience participation.
Basically, the balance is all off.
There are levels of 'inclusion' that's completely fine, but to have agendas smashed in your face is off putting as a whole, especially if a storyline doesn't reflect it as a baseline.
WW2, Westerns, Disaster, Vietnam, Mafia etc but the Marvel films made the movie companies so fearful about putting anything else out.
And it just went on far too long, the early ones were decent but they just became repetitive, dull and safe.