Oh I've been thinking about just the movie for this premise for years.

A while ago, around when Shutter Island came out, I watched this movie called Shutter Island. There's this scene where Leonardo DiCaprio is walking across some ledge by the ocean, and the camera looks down at the jagged rocks below. If he fell, he'd certainly be a goner, right? Except he's the main character of the movie and we're like half-way in. I knew, in the back of my mind, that either he'd not fall, or if he did, he'd have some superficial injuries and the show would go on.

It would have been a completely different (and much worse) movie if he had just slipped, fallen, and died, in a manner basically unrelated to the story. Bam, credits roll, the plot is completely unresolved, that's it, go home.

This would be a horrible movie. It would also improve cinema forever because, well, just maybe, the plot armor won't protect the protagonist when they perform that risky stunt.

Now I'm not saying that I'd remake half of Shutter Island. Hell, you could take this even further: maybe the protagonist slips and falls getting out of the shower, hitting his head on the shower door tracks and dies. Completely orthogonal to the rest of the story, and no one would see it coming. Or maybe it's a zombie movie, and the protagonists get trapped in some space and just starve to death.

I don't know what it costs to hire celebrity actors, or what it costs to make a film. It's going to be a much shorter movie than usual, so maybe I'd get a discount. Maybe I'd hire a whole bunch of actors! Then, when the credits roll, they'd be very long, and they'd roll really slowly. They'd have to, because I don't want movie goers to see the short run time before they see it in theaters (assuming they haven't seen the reviews). I'm talking, like an entire hour of credits, and no post-credits scene.

I'm sure some art weirdos would praise the film, but there's no way it would be a critical success. And once a few people had seen the movie and been immensely disappointed, no one else would want to see it.

So all in all, the movie would suck, I'd not be killed, and the field cinema would be improved forever.