I've seen those studies and his discussion of them. They all show that people would have to be paid a lot to stop using the internet (and they'd still be benefiting from its side effects), and they'd pay a lot if that were the only option. That indicates a huge consumer surplus, since you don't have to pay a lot for a base level of internet access.

Do these studies take into account the collective action problem? It's clearly extremely costly to forsake the internet now that everyone expects you to use it, both privately and professionally, so that it would render you an antisocial weirdo and likely unemployable. I certainly wouldn't accept it for anything less than a fortune, but on the other hand, I could definitely see some serious upsides if the state of communication technology were magically reverted twenty years back -- so much that I would have to think carefully about the answer if I were given this offer by some supernatural force.

Also, of course, preferences that are stated rather than revealed should always be taken with extreme skepticism, since they're likely to be heavy on signaling.