The obvious response is that you'd have to swap out all the Ethernet hardware in order to get the speed advantage, which gets a bit expensive. The other half i

The obvious response is that you'd have to swap out all the Ethernet hardware in order to get the speed advantage, which gets a bit expensive. The other half is software, maybe, but I honestly doubt that is actually the problem here. We've been encapsulating protocols in other protocols for so long that that problem is essentially solved in all but the weirdest, most obscure cases, and this wouldn't be that weird or obscure.