I would certainly drop any class that had such a strict phone policy. I rely on my phone for its text messaging, and e-mail capabilities. In fact, I often (several times during class) check my e-mail inbox. Does this disrupt the class? No, because my phone is silenced (from keystrokes and ringing), and I'm usually actively participating in learning, and so phone use is prioritized accordingly. I am an adult, and I will not have another adult discipline me for keeping an open line of communication with those that are important to me, or my obligations.
Will I take pictures of my professor or other students? Not unless they ask me to. Will I take a call in the class? Absolutely not -- I'll leave first. However, to be asked to "check" my phone at the gate, or turn it off completely is just not going to fly. Even if I did not need my phone on for work purposes, I would expect to be treated with enough trust to not use my phone actively during lecture. If I broke this trust, I would expect to be asked to leave the room.
As far as this article/situation -- the children were being disruptive, and should be disciplined. However, I am against any blanket result coming from this particular situation. We're individuals, not sheep. I'm a firm believer that there are levels of trust, and thus levels of discipline.