and it never will be used. More below.
That might have been true at the dawn of the satellite era when cables were still coax. These days, the TAT-14 cable has more capacity across the Atlantic than all satellites combined, and that's not even the fastest cable.
Well, sure, it was an arbitrage play since leased lines of any sort, not just satellite, didn't pay into the access scheme. This has nothing to do with satellite, and just reinforces my point that the high price was due to politics, not technology.
Setting up multicast on a PC is not the problem; you can install a program and be done with it. The painful part of multicast is that every router between the program source and each listener has to be set up to pass on multicast traffic, perhaps with some IP-in-IP tunnels between areas where multicast works, but the multicast must be supported on the end user networks or there's no point. If you think that Comcast and Cox and Road Runner are going to provide multicast for free to subsidize parasitic competition with their own cable radio offerings, or Verizon or SBC are going to add anything that will make it easier for people to compete with the always present chimera of ADSL video-on-demand, I would like some of whatever you're smoking. I can see it in WiFi cybercafes, but that'll never be more than a tiny niche market.
I realize that car companies have done stupid things in the past, but why in the world would they want to provide satellite radios that don't worj the satellite broadcasters? XM or Sirius or maybe both would pay car makers to put in receivers that can receive their stuff. I suppose that in theory GM could try to invent their own proprietary sat rad network (don't they still own Hughes satellite?) but I don't see them heading down that rat hole.
It doesn't have to happen to every car right away. I would expect them to start with high-end brands whose owners would be more likely to subscribe, and to provide a few months for free to get them used to it.
R's,
John