Has anyone ever applied parallelism to movie making? Hire multiple casts and shoot each scene multiple times. In post production, edit the footage into multiple movies.
As I see it, there’s several reasons to do this:
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This technique could allow audiences to choose a version they wish to see. A superior performance would attract more viewers. If audiences want to avoid a particular actor, say Keanu Reeves or Tom Cruise, they can do so. 
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Movies could be made with more diverse casts. Audiences might choose a version featuring actors they identify with more. Overseas editions would feature native actors speaking in the native languages with no dubbing or subtitles needed. 
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Regardless of the number of casts, much of the movie making costs are still fixed: pre-production (script, location scouting, casting, etc.), shoots (set design, lighting, props, costumes and makeup people, stunts, etc.), and post-production (score, foley, fx, editing, marketing etc.) Additional costs do come from cast salaries, extra costumes, makeup, food, and film, but I think the incremental cost for each additional movie would be surprisingly low. 
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Most actors wait around for their scene because it takes time to set up the shot, light it, etc. I think it would be possible to shuffle in different casts relatively quickly once they are ready to shoot. I don’t think it would greatly lengthen shooting schedules. 
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The studios might be able to save on cast salaries by casting cheaper or unknown actors in starring roles. There is less risk of catastrophe if an actor turning in a terrible performance… plenty of backup performances to choose from. This might even give actors incentive to outperform the other cast, so fewer actors “phone it in”. Also, this would provide a larger pool of actors to go do press junkets. 
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The first time this is tried, people might decide to watch all versions, as a curiosity. Afterwards, box office numbers could be better if some people decide to see things again with a different cast. 
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Technique can be applied to both regular and adult movies.