Maybe I don't "get it" but I'm not convinced that digital downloads is going to be the primary delivery method anytime soon.
Among some of the Pros of a system would be:
1. No need to distribute physical media. [Lower costs]
2. Allow niche items to be distributed efficiently.
3. No need for shelf space or similar.
The cons that I see, off the top of my head, are:
1. Are american ISPs really going to be happy about supplying 100x the bandwidth that I would normally use monthly to handle digital distros?
2. Are movie studios really going to send out a clean digital copy that I can expect to play without even more DRM headaches than we have now?
3. Are we going to get the same quality audio / video with digital downloads that we'd get with physical copies? IIRC the number of companies that would allow digital downloads of a DVD at full bitrate are by far the minority. I'd rather have a higher quality / higher bitrate version any day of the week.
4. I will still need to burn a copy of the items that I buy anyway. I doubt that I'm going to trust a HDD to store my movies for 10 years +.
5. What are Joe & Jane Sixpack going to do? How are they going to react?
6. There is some logic behind digital downloads which means that it won't be allowed to happen
EDIT: I honestly see the cons or roadblocks to strongly outweigh the pros for now and the near future (< 10 years).