You can get everything you want, except the ability to snap your fingers and fix and oversight in camera needs, with the purposed set up. I personally think it is ridiculous to purpose that an item that is projected at a $33k price point be sold for $3k with the idea of firmware rental making up the difference. Notwithstanding that the addition of the firmware lock out protocol would add to the cost of the camera and potentially even the size.
Right now you can buy a Scarlet brain and if you need to jump up to something beyond your brains capabilities you simply rent the brain you need.
Not to mention the fact that firmware unlocks can and would be hacked and David's point about manufacturing.
It's an interesting idea but I feel that it is inherently flawed.
Just me view.