[foldr]

I agree with your points, but it might be worth noting that the resolutions you're talking about are not so easy to achieve in practice. To get 100MP out of a medium format frame you need to scan it at around 4000dpi, which isn't really achievable unless you send it to a professional lab (which can be quite expensive). Of course, there are cheap flatbeds now which claim to have an optical resolution of 4000dpi or higher, but you never get that resolution out of them in practice.