Well you should be very concerned, although not so much about what the article is about. Most of the porn they are talking about is viewed by people 40 and up. Teenagers have very little interest in it - why should they?
A few years back my wife changed jobs and in her new one she interfaces daily with many teenagers and young adults. Why would they want porn, they have an entire sub culture that involves nothing more than cell phones and social media sites.
On a pretty regular basis she has to settle arguments, often involving a young lady that provided a young man with a password to pictures of her in the nude and semi-nude. The dispute isn't about him viewing them (that was the intention all along), but that he allowed friends to view them as well.
The kids have there own language, spaces, and places in cyber space where they get up to things that would make Hugh Hefner blush. Sadly, this goes on right under most parents nose without a clue as to its existence. (I will fully admit that until my wife took this job, I had NO idea that such things went on. In the interest of keeping some morality on the board, I won't mention any of the other activities frequently documented.)
All I can say is, in 20-30 years the social mores better change such that nude pictures and pictures of people engaging in sex acts are no longer controversial - or there are going to be one hell of a lot of embarrassed people!
You've never had any pre-teen boys without driver's licenses living in your home and messing with computers, have you?