if BM decided to stop developing of that camera it would be great to open the firmware to users
There's a long list on manufacturers who could do that but won't.
We see it as a way to improve hardware we own, they see it as infringement of their IP's copyright, or allowing their competitors to read their technologies secrets.
Frankly, it would force manufacturers to innovate more, but if done right with 'official corporate oversight', they could leverage the tech community as developers, rather then just unpaid Beta Testers.
It would boost a companies own products, if owner groups were able to come up with the code for features we want when we're working with the cameras - using my Cion as example, I'd love Raw at 1080p, 4:3 mode for Anamorphics, higher frame rates at 10 or 8 bit, instead of only doing 12 bit.
A user group could come up with the code, test on out-of-warranty bodies, then submit the code to the manufacturer for ratification and certification, with the manufacturer then offering it as 'Community Driven Add-on Features'
The manufacturer would then know exactly what features us operators want in future models.
I'm betting that the first company to do it, will end up with a user base more loyal then Apples, Coca Cola's or GM / Ford,... in turn, that will mean the ability to creep prices on the profit margins.
But who's going to complain if an expensive investment will last longer and be supported for longer - amortised over the extended life of a product, our investment as owners would increase in real value, and better retention of value for secondhand sales.