I think what Bernie is saying is that for decades Dems have paid lip service to working class concerns while not actually doing much. In reality Dems have been much more beholden to corporate interests.

By the time these plans came out, too many working class folk were already disenfranchised. They saw a party that was vocal about social issues that frankly were not high on the list of priorities for most of them. They were more concerned that inflation was out of control and they could not afford basic expenses. Sure Trump was racist but at least prices were lower when he was in office, or so they would conclude. If he could bring prices down, they would go with him.

Basically Dems were just out of touch with the most important part of their base until it was too late.

Audiences have always been interested in good storytelling. The reason the MCU took off was because it told good stories. The problem is that the stories have become too formulaic or half-baked.

People showed up for Deadpool and Wolverine, so the issue isn’t about comic book movies.

EDIT: My comment about D&W isn’t meant to hold it up as an example of good storytelling. As I said, the stories have become formulaic. My mentioning of it is meant to point out that many comic book movies succeed despite mediocre storytelling. You can’t say “audiences are tired of comic book movies” when many are still clearly successful.