God, this is such BS. Data caps on landlines? All that does is give away that the ISP has been neglecting its network (for years!). Unless, of course, it's an arbitrary and unnecessary restricition added purely to screw customers out of money.
If the US actually had a functioning market for broadband (and not a series of local monopolies, as it is today), this would be nonexistent. The only logical way for an ISP to function is for it to strive for better speeds to users at all times, and backing this up with constant upgrades to its central networks - ensuring that they can handle the necessary load.
Data caps barely make sense on sensitive, unstable mobile networks. For landline broadband, they're utter BS. The author sounds like an utter shill here (or at best ignorant enough to regurgitate monopolist PR spin).