With that, for your first point, let me give you a scenario and please explain
Joe is on his laptop and has 5mb/s upstream connection. He wants to stream a 1080p video at 1mb/s to 10,000 people.
In the case above, without a relay server (as you suggest), How delayed will the data be for viewer 10,001, assuming every peer has the same connection profile at Joe ? Hint - Its going to be minutes, not seconds.
Second question: What happens when several peers in that chain disconnect at once?
Now as far as your second comment, that feels out of place. Bandwidth is bandwidth. If you are on a 100kb/s line in the middle of africa, your preference is going to be a user to server to user streaming environment since it will be reliable and not require other users with little bandwidth available to them to also stream. In fact, using a P2P system will cost them more money, not less. Its going to be inconsistent, unreliable and slower than p2s2p streaming.
