Solid overview, makes a lot of sense. Some parts of the problem sound like they could be described as a tragedy of the commons. Things would be more efficient

Solid overview, makes a lot of sense. Some parts of the problem sound like they could be described as a tragedy of the commons. Things would be more efficient all around if we just allowed intelligent bandwidth sharing through P2P, but network administrators concerned about the impact on their particular networks prevent such moves, actually making everything less efficient. Not to understate the other technical hurdles. Good points, thanks.