It is a big problem. It's unrealistic to expect patients to have access to a DVD ROM drive, let alone the know-how to use any of the software mentioned
Software is the least of your problems.
Web viewers exist too: https://ivmartel.github.io/dwv/
Not to say it's great UX, but it's really not that hard to solve compared to the rest of the mess of the medical industry.
It's a bureaucratic nightmare thing, not a software challenge.
that said, tfa, while encouraging, has no details as to how this all can possibly happen.