Keith;
] > one business model that might be understandable is: you should support
] > multicast if/when it saves you enough bandwidth (over the same content
] > being sent over separate unicast streams) to make it worth your cost.
]
] It means it saves nothing for receivers that they don't want to
] receive multicast stream.
]
] Then, senders are not motvated to send multicast stream.
maybe the ISPs supporting multicast could prioritize that traffic, thus
providing better service on multicast than unicast, thus providing an
incentive for receivers to use multicast over unicast.
Prioritization is orthogonal to uni/mulitcast issue.
Users will favour those ISPs which prioritize unicast and pay more money.
Other users may use the prioritized multicast for 1:1 communication.
Masataka Ohta