Having passed through the Black Hills recently, I'll say that I did see a number of trailers with bikes on them, Harleys, etc. But its not as if I saw a fleet of sport bikes, tourers or SOHC's to compete with this "false motorcycling" by trailer.
I dunno. We'll see what I say about trailering bikes when my knees and back are shot. Until then I shall remain "hardcore", as they say.