All my cameras are stored in my dedicated Camera Room, on shelves, in the open where I can see them and pick them up at a moment's notice. I don't want my cameras hidden in cases. I don't want to walk around with a camera inside a case.
I'm an engineer. I appreciate all aspects of the design of the camera itself. The case - not so much. Yet I keep them because the case and camera have lived their whole life together.
You will die at some point, or want to sell on your cameras.
Since you have so many cameras, most will be in very good useable condition by that point (you can’t wear them all down). Chances are your collection will be spilt up and people will want to use and/or display these cameras, and have different wants and desires.
In your mollycoddled display room, and taking them out to play once in a blue moon, nothing bad will happen to them.
But once, even when a responsible careful person hangs the camera around his neck or has it in his bag, it will lightly bump against things or accidentally be pressed against something hard. Such damage is what the case was designed to prevent.
Don’t take that out of the world or away from future users, by simply tossing the cases.
The reason why your cameras came to you in good condition without too many scratches and dents, is because people used to be good at taking care of their stuff, and they used their cases during transport or storage.
I also find it hard to believe that you can’t at least appreciate the art and skill that went into the design and manufacture of these cases.
They might not look like much when in disrepair, but with a little work many of them can be brought back to looking good and being functional.