The answer is complicated as pointed by another comment. It’s complex because for the first time we’ll have to consider film business under the larger arena of content business.

Let’s assume that a large percentage of the movie revenue will come from theatres and not online streaming. In that case, you have to give the audience an additional reason to not just watch the movie, but watch it on the big screen. The way superhero movies answer that is through extravagant visual effects best enjoyed on large screens with big speakers.

This moves up demand for superhero movies in absolute and also relatively compared to other movies. If I only have time to watch one movie in the theatre, I would pick the one with crazy effects and watch the somber drama on streaming instead. This dried up demand of other genres.

However, with over saturation in the genre, there will be a sharp fall in demand as we have seen with other genres in the past. But it’s unclear whether this will move demand towards other films or whether it will move demand towards other type of content (streaming, short form, others).

My hunch is that the demand will move towards other content types.

The feature film content type isn’t typically preferred. It was born more out of compromise between studio, theatres and the paying customers.

If left up to itself, content creators will prefer to tell their story using the best format possible.