I hope we just have everything in digital non-fixed size formats so we can display them easily on a device of any size.
Yeah, but what about stuff where the format really matters? Most people want numbers on receipts to line up vertically. There exist spreadsheet looking reports that are just big tables of numbers. There are, perhaps, ways of presenting that data in a more fluid layout friendly way, but that's not an easy thing to do.
Apart from DRM that dream could be a reality fairly soon.
can you give an example of how this is really a problem? I have an iPad that can display PDFs. When I scan documents PDFs get created.