Originally posted by Simen1 The size increments are small enough today. Canon left the middle increment between 1,6 and FF for a reason. I expect the MF 44x33mm format to vanish too, like APS-H, in favour of something with a more notable difference. For instance 53,7 x 40,4 mm.
Having many small increments reduces the mass production economic advantages. I think that if the whole digital imaging era was restarted today without any legacy compatibility, there would be larger increments (2x), none of the different sensor sizes would share mount (like APS-C and FF does now) and the focal flange distance and flange diameter would scale in increments, in the same order as their sensor sizes does. And very wishful thinking, all the camera companies would agree on the same mount (mechanical and electronic) for the same sensor size, and not limit anyone from making official specced AF lenses. That would result in fantastic free and healthy competition, like the virtual goal of capitalism, but of course, that would be a nightmare for the camera companies if they had to compete harder. They think they are better off by sitting alone on each their proprietary Islands and don't cooperate with any other company. Sorry I drifted into politics and hypothetical alternative worlds. Right here and now, APS-H is dead and thats a good thing. Next up is the 44x33 format. Then maybe the 1" format in favour of a new 1/2" format meant for phones and other thin devices. Yes, I believe lens mounts are coming that way sooner or later.
I wonder if you give prevision ot if you just want you dream to become reality ?
There no technical reason for different mount. No more than there reason to prevent your car to use tire of different companies.
If companies do that, it is only to protect their own investment and network. They all hope that if you invest into a body and want to upgrade to better lenses, you'll start to spend some money on lenses and then would be relunctant to buy the next camera in another rmount. It is a barrier to exist and to keep the client captive.
Also, if you don't share the mount among different sensor size, you remove an obvious upgrade path and people are as likely to upgrade to another brand. Even a cheap prime can typically still work on FF and people can schedule their upgrade path. They get the impression they save doing this way. That's another reason to stay: there a way to get better gear progressively because you are part of an ecosystem.
So no, they would not do that.