in reply to
The next successful successor to DVD as a medium for video will be:
If the DRM guys get their way the system will be connected to the 'net in some form so they can control what you do with the media.
Copy registers to your player so you can't pass it on
Time limited versions
Play limited versions
Record of viewing habits to target advertising
System inserts ad breaks into programming - only joking
Actually what'll happen is some mechanism to insert the experience of seeing
the program into the brain without needing to make the programme at all. This is personal, each viewer would need to pay, copy protected as there is nothing to copy, fast - no need to sit in front of a 3 hour film.