Replacing optical media with high speed lines would allow some funky new market mechanics like...
Games:
- Instead of downloading the full 12Gb+ game, simply load levels/textures as needed
- Distributed game session hosting where the players temporarily and reliably become the host of a shard
- Something like OnLive could be high res/low image compression/ultra low latency
- Download 12Gb+ games on a whim and pay as you go for playing it - stop playing/paying for it and the provider can cancel the game's certificate and it gets pulled from the system. Want it back? Download it again in a minute, save games and all
Movies:
- Make way for 4k video via net
- Make way for low compression 1080p video via net
- Make way for every person in the household streaming 1080p...while video chatting in 1080p, while playing an RTS on an OnLive-like service...while backing up their files to a remote server. Etc.
The future is going to need some big pipes.