I listened to the video.
I am going to say that I liked how the problem is posed.
It is large step towards a solution, to pose the problem in a meaningfully nuanced, yet open-ended way.
At least for me, the video invited ideation.
So, here is what I am thinking (and I apologize if this idea was brought up before, I did not read all the comments):
a) Create an open source collective covering film camera, film lenses, film and film chemicals (like Apache or Eclipse for open source software)
b) Invite contributors, create a process of contributing, reviewing, voting/disputing on individual contributions and projects
c) Create a sustainability process (where some contributors leave)… basically use Open source software as example of the process to emulate
d) The Result of the open source collectives work should be blue prints, CAD designs, 3rd printable parts, electronic schematics, etc
e) The non-free part of the people working in the collective would be productions, certification, consulting, repair, etc.
Basically, I think re-creating a camera manufacture will not re-creating a sustainable film-industry.
Instead, we would need to re-think the undercurrents of the business model.
The author of the video is thinking about emulating engineering from the 50s by a newly formed (or, perhaps, bought/resurrected corp) -- but, I think
open-source-software like model would, at the end work better.
And provide 100+ years of sustainability and innovation.
One other thing that will happen with open source collective,
is that existing (or closed by now companies) with donate into that collective their previous designs (that they no longer view as competitive advantage). This is currently happing in the software/hardware industries with the CPU/ISA (instruction set architectures)
So overall within 2 years of establishing that collective, I am sure there will be enough technology blueprints, and contributors to start manufacturing prototypes.
This would be similar to what's happening, again in software/hardware space like Arduino, Raspberry PI, etc
Given the above long term sustainability (covering servicing, innovation, certification, consulting, etc), transparent and repeatability -- I think great things can be accomplished.
Just in this forum board along, we have optics designers, engineers, mathematicians, business folks, probably lawyers, etc.
--
With regards to specific things like type of shutter, mount (m42), etc -- overall I think I agree with the author for initial product set.
But assuming that this Open Source Film Photography collective (let's call it OSFiP

) works, the sky is the limit in terms of electronics that can be leveraged.
P.S.
Sorry it was not clear if the OP (
@Horatio ) is the video author. Thank you for sharing this.