If film production dissappears and Leicas exists , Leica company would find a way to be able to use these Leica I II III and others with digital sensors. I wish this would not happen in next 15 years and new technology would be able to deliver better pictures cheaper, not now. May be they would be able to print circuit on thin film , once installed , no need to remove it until next model. I did not hear a film thickness HR CCD technology yet but may be exist today.
Why would they do that when they can sell digital cameras without the retrofit problems? The business model that you are suggesting will not work.
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.