But we already have such a slow lane. And it already made the internet less free and less useful. It's the upload bandwidth. Weak upload effectively killed peer to peer. File sharing is slower than it could be, and e-mail, chat, blogs… are all in the "Cloud". Very convenient, but also dangerous (insert random EFF or FSF argument here —they all apply). With a worthy upload bandwidth, all these things could use a serve…
I'm pretty sure you can still get ISDN lines from your local telecom provider. I know a long time ago there was talk of binding ISDN lines to together to increase upload and download speeds. This was right around the time DSL was blowing up so I'm sure it got lost in the wave of DSL hype.
Of course compared to DSL. GigaFiber, or any of the current technologies, it's downright pathetic.