Keep the laptops, keep the wifi.
Explain to students that there aren't many professional work environments that ban either, so they need to get used to managing their own usage, and get used to people around them doing things on their laptops. It's an opportunity for people who have problems with either or both to learn that if they can't rein in their attention, they're going to fail at class, at work and at life.
For those that say that it's not the job of the class to teach these lessons, I agree - it's simply the students' job to take control of their own life. It's no different than someone tailgating you on the freeway or cutting in front of you in line. University classrooms are learning environments and professors and TAs should help enforce that, but they aren't surrounded by some magical force field that entitles you to a guardian angel when you walk in.
If Joe Laptop won't turn off Netflix or Quake Live, grow a pair and ask them to turn it off, or just get up and move. Don't sit next to him next time. If your classroom has become a LAN party with every student except for you participating, talk to the TA or professor after class and ask them to help. It is their responsibility to help ensure that you have an opportunity to learn; it's not their job to guarantee that you'll have a private fort wherever you decide to sit.