Let's put it this way: art house theaters are vanishing. They have almost disappeared completely, and that means there's a shift in what audiences want to see. And they have to be aware of that and be realistic. It's as simple as that.
Technology has a great advantage in that we are capable of creating dinosaurs and show them on the screen even though they are extinct 65 million years. All of a sudden, we have a fantastic tool that is as good as dreams are.
There are certainly laws and elements that make a film more accessible to mainstream audiences. If you've got Tom Cruise as a strongman, I'm sure it would have larger audiences, but it wouldn't have the same substance.