I like to think that the reason the six strikes scheme hasn't actually been implemented yet is due to public pressure. They say it's going to happen real soon now. Torrentfreak speculates in that article that none of the major ISP's who have somehow been duped into participating--Comcast, Time Warner, Cablevision, Verizon, and AT&T, want to be the first to take the plunge. And who can blame them? Surely they're own boards are wondering why they are going along with harassing their customers.
After all, to a man, all of their advertisements for internet service emphasis downloading tons and tons of free media. It is strongly implied.
I mean, I know it's not massive public outrage, but for the leading edge--geeks--it is already pretty sharp. As reader MJM observes in a comment here:
I don't see why anyone would have a problem with this.
It's just like the phone company listening to your conversations and then letting you know that it sounds like you're running a phone scam and if you don't knock it off, they're going to disconnect your line.
So there you go. What smoke and mirrors did the MPAA and RIAA use to convince these guys to go along?