Well, I think what Karl means is, given a household has a 40 Gig cap per say, that cap is still there. Most households, (at least in my area) have smaller kids that will eventually use their internet which means, more of it used. Plus with the amount of video, ads etc. on each page, people don't realize just how much they actually download.
So in essence, yes, it does effect most or all households in a way.
