I've having trouble typing because I'm in full riot gear. After the last time I had an idea, I'm not taking any chances.
If Ethernet is better than USB, and I think we all agree it is (?), then why do SACMs have a USB port? Most PCs these days have a NIC or Ethernet built into the motherboard. Given that a NIC can be bought for a £10, probably less if bought in bulk, maybe NTL could provide a free NIC to those who want one? The user would have to install it themselves - or get their 10 year old to do it - and there would be support issues but on the whole it's fairly safe and cheap. Ethernet is far less problematic than USB - no nasty CD needed for a start.
Right then <drops visor>