My wife and I were just discussing this... it started out with the fact that we're part of the 20% of US households that don't have a land (phone) line; just cell phones.

After discussion, we concluded that we'd ditch our land internet connection once we could get an all-you-can-eat data connection, such as the one mentioned in the article, for $50/person, and not have our data connectivity costs go up.

Looks like this will become a reality once the price drops by 50% (and this becomes integrated into an iPhone/android-based phone).