Be advised that this seems useful only in broadcast media. In practice this means only wireless, such as 802.11g (Wifi). There are no more wired broadcast media in widespread use, the new Ethernet standards specifying that each endpoint must be individually switched (no more hubs). This could improve the bandwidth of all broadcast media tremendously, at a cost of higher memory (for storing the sent packets) and processing (for decoding) usage.
tl;dr: Better Wifi and WAN wireless nets in the next standards.