I've been hanging for 11 years and it was extremely rare to see anyone with a hammock. And like Doctari said a few posts up about we never thought we'd be mainstream and yet here we are.
Now I find it odd to paddle past any group site and not see at least one hanger.

I think of hammocking like the mountain bike craze of years ago when it first started. They used the same trails and issues started to happen with increased use and erosion on trails. Also new trails were being made outside the boundaries and the mountain bikers started to get a bad reputation. Pretty soon places were designated off limits to bike use.
So what happened? The mountain bikers started to police their ranks, get organized and form regional chapters to promote responsible biking in the forests and even volunteered to help rehab trails and work with parks people to fix the problem and push towards muti-use. Now you don't hear much about what was once a huge problem and the mountain bikers have really cleaned up their image.
As hammockers, we should keep from having it even become a problem in the first place. Just because you don't temporarily flatten the weeds doesn't necessarily make us LNT if we cut and slash at the areas surrounding our hammock trees. Over time, it's just as bad as overuse. The areas I've seen will be as bare as tent pads in just a few short years.

Something to think about.