It's not just a learning curve. It's a completely different way of thinking. Anyone can pick up a DSLR and get decent images, but to be able to make a cinema camera look good, you need to think like a cinematographer. You need to be able to light scenes. You need to have a DIT on set. You need to have your DIT verify and backup your files. You need to have a post workflow in place. Are you going to shoot raw and then convert to ProRes, or simply shoot ProRes Log? You need to have a colourist, and you need to grade every single thing you shoot.
Contrary to it's name, the Blackmagic camera is not in fact magic. It's a cheaper alternative to a digital cinema camera. It doesn't automatically make your image any better than anything else simply because of the camera it is. There are going to be a lot of casual DSLR users who will buy the BMD and be disappointed with their images because they won't be that much better than what they got out of a DSLR.
You seriously have that exactly backwards.
It'll be significantly easier to use a more high-end professional camera, in the sense of exposure... the ironic thing about professional cameras are they let you screw up...
Since they have so much more latitude/dynamic range, you can fix missed exposures in post. You can pull detail out of the "blown" highlights or out of the underexposed shadows; and get a useable image.
Your standard DSLR has roughly 8 stops of DR (at best) and you're pretty much stuck with what you exposed for when you shot, the BM Camera has 13 stops; plus the better highlight roll-off. With DSLRs or smaller HD camera, your stuck with what you shot... if you don't know what you're doing, you're going to get what is essentially unuseable material.
The same thing goes for color... due to DSLRs 4:2:0 AVCHD codec (which you're stuck with), as soon as you try to color correct beyond a certain point everything falls apart and macro-blocks.
Not only that, but why would you do it 4 times? You'd generally only do it once - you take the processed negative and dupe it to a positive for projection.
No you don't... I'm sorry but it seems like you really don't know what you're talking about.
You take your negative, telecine or DI for your rough cut, then go to an inter-positive (whether that be your DI or an optical inter-positive), from the original negative via an EDL. The inter-positive is your "Positive Master"; generally there a about a half-dozen inter-positives made. Then your print your inter-negatives (a few dozen are made), which is your "Master Print Negative". Then you move onto release prints and make a few thousand copies... You're inter-negatives are going to get seriously worn out, and deteriorate after about 100-200 release prints being made. Running a physical piece of film through a machine 100 times doesn't do anything good too it. Plus you're introducing the dirt and lubricant gunk (most films are printed on "wet head printers") contained on the sprockets of the release print printer onto the inter-negative every time you run it through the machine. So you keep switch out inter-negatives to produce your release prints. Eventually you'll run out of useable inter-negatives, and have to go back to the inter-positive, to make new inter-negatives, to make more release prints.
With a DI the best you're doing is removing the physical inter-positive from the mix and going from the original negative straight to the inter-negative via digital inter-positive (so you retain the resolution of the original negative). So like I said you're coming out with only SLIGHTLY more resolution than you would have, had you not done a DI.
If you were to make release prints from your original negative, after about 100-200 release prints your negative would be completely fucked, and now you no longer have your original source material.
http://hollywoodfilmco.com/HfcDcp.htm
At this point, I'm done this discussion...