Jana;
1. Color film coating for amateur use is being supported, for the most part, by motion picture film production. If the motion picture industry converts to digital, there will be no compelling reason to continue to make the relatively small volume of film for other uses. Now, I admit that 100 - 200 million cameras full of 35mm film may seem a lot, but consider that this came from a 42 inch (~3.5 meter) roll which is 5000 ft long (sorry, I'm tired converting). At current coating speeds this could probably be made in less than a day! So, supporting a facility that is to be open 24/7/365 becomes problematical.
In fact, the figures you quote are a fraction of the motion picture production of Kodak, at least IIRC.
2. Research on digital printing is directed towards solving the problems you cite.
Our youngest daughter is an engineer at Xerox in the color printing area of R&D. She cannot talk about her work, but I know just enough to tell you that this is the main thrust of her work, and I was present at a Xerox demo of high speed color printing about 2 years ago that would have knocked your sox off!
3. (not in your list above but important to note)
In the 100 or so years since Lumiere cease production of Autochrome, about a half dozen people have tried each year to reproduce the Autochrome process without success! This includes the actual people involved using the original equipment! There were 'secrets' that went unrecorded in the production of this film. Therefore, if color film production is stopped for any reason and the teams are disbanded, it will be difficult if not impossible to restart production.
I have coated Ektacolor Paper and Kodacolor Gold 400 film but I do not know the entire formula. I just know that XYZ100 goes into it at 400 mg/mole of silver in the magenta layer, but only at 200 mg/mole in the yellow layer, and etc.... Someone else had checked out XYZ and ABC and DEF and suggested XYZ to me without naming it. I used it. It worked. I used emulsion 4420, 3129 and 1010, 1:1:1 in the magenta layer with dye B-11111 at 300 mg/mole but I might not know the emulsion formula, nor the dye formulas. This will vanish!
You simply do not understand.
Sorry.
PE