No one changes channels any more.

The top pay-TV providers account for 94.0 million subscribers [0]. Unless they're all turning on their sets and settling for whatever happens to come up, many people are changing channels.

[0]http://www.leichtmanresearch.com/press/111615release.html

I think what the parent comment is saying is that channel surfing is no longer common. For me, it basically died out when we switched from ~100 analog cable channels to a zillion coming in over a STB that takes forever to change from channel 10 to 11, and then to 12...