There are three stages in production of movies and tv shows, roughly they are:

Preproduction:
- where screenplay is written or adapted, cost is usually low unless rights are to be managed for original content you're adapting from.
- Production schedule and directors shooting script is done, sometimes a storyboard too (skilled storyboard artists COULD be somewhat replaced by software and there are attempts)
- Sound designers start their work (sound design is a major component of content along with images)
- Composer starts their work
- Location scouting and permits are secured (permits for natural locations can cost a serious amount of money)
- Art director and art departement starts working on costumes (costs a lot of money) and designs for sets (we'll get back to this)

Production:
- Camera and grip departement can get huge... I've done only a moderate size productions and my camera and grip dept. was 20-30 people (skilled labour that costs money)... also cameras cost (with RED little changed because camera itself is usually from rental so prices are more or less the same)... lenses cost (Ultra primes are around 250.000 euros per set - if someone can make a startup for prime lenses for PL mount there's your business)... grip costs (cranes, dollies, russian arms, whatever your production actually needs)
- art department can also get huge, wardrobe, set, makeup...
- talent - you need them before production for actors rehearsals and if their name is recognizable it bears marketing power, which they cash in from you

Postproduction:
- Color Correction can get attacked with software, Assimilate Scratch software tried to attack it with their software but it is still expensive, Nucoda Baselight and Quantel are still very expensive... not to mention hardware ccosts you need to run 4k dpx files at realtime
- VFX usually require a large amount of highly skilled labour with a serious hardware power for rendering
- Prop dept. is rare in talent and costs a lot of money, traditional FX even more so
- Sound designers which are good are rare, they cost, their hardware and software costs. Foley is even more rare to find.

And now most important part about pricing structure (falls in both preproduction and production) - Setpieces http://en.wikipedia.org/wiki/Setpiece

Setpieces are what drives most of the costs in high budget movies, they are akin to large theatre production where there are extravagant sets. Building setpieces needs engineers, builders, material and is already shaved of from profit as much as possible.

Marketing and distribution is a sizeable chunk of money in a project too - and this is actually a part of disruption that could make a difference. If raising capital and subsequently marketing and distribution could be taken care of, it could work - but IMO only for low budget projects (up to $20 million).

Just to summarize a bit:

Even if by some kind of magic you could downsize in post production (lots of people, lots of hardware, lots of work) and do it for free and in preproduction if you could write a script for free, do locations scouting and production scheduling for free (movie magic scheduling software is $500 I think)... you still have 30-60 days of principal photography where you need set building, actors, 50+ crew, electricity, transportation, natural locations permits. Those are all highly skilled workers and if you only paid them you still break a $1 million budget, sans equipment and everything else. It's an expensive sport. Lucas calculated that a low budget movie is in a ballpark of $20 million - with marketing and distribution, half of that without it. He's right.