$500M movie? The most expensive movies ever made top out at $300M (source:
http://en.wikipedia.org/wiki/List_of_most_expensive_films ). Your average major studio film is more likely to be under $50 million.
And $4000 a day can add up pretty quick. 50 days is approximately the average number of days for filming. That's $200,000 per camera. Since you frequently want to do shoot from a few angles, you're talking a half million or more just for cameras.
Now, for a normal Hollywood blockbuster, at $50M, that's significant but not too bad. For an independent film, which will likely have a budget under $10M, and sometimes even under $1M, that's a pretty substantial portion of your costs.
So cameras that cost $10K to buy outright will make a big difference in this space. All of a sudden, things that were prohibitively expensive to independent filmmakers are within reach. Independent films allow people to have more artistic creativity given that there's less at stake; they can also be the "long tail" of filmmaking, covering more niche interests than a big blockbuster is going to have to. So this could be a fairly significant disruptive innovation, if these turn out to be worth it.
Of course, it's not quite as good a deal as it might seem at first, since I believe the price quoted is just for the very core of the camera, containing the sensor, and not lenses, which are where some of the real cost is. But still, these will allow people to do 4K filming who never have been able to do so before.