While I too lament the lack of enthusiasm about this event, it doesn't surprise me.
When most people, riders and civilians, hear the word "rally", they think of Sturgis or other gatherings that use that name. A rally to them is a destination, not an competition.
If you explain to them what a true rallying is, and in this case the extremism of it, it sounds crazy and dangerous.
Unfortunately, most riders have no interest in riding long distances, which they would consider over 200 miles.
The young guys want to go fast and do wheelies. The older crowd prefers to dress up in black leather and ride to the bar.
Those of us that want to explore far from home on a motorcycle seem to be a dwindling group of enthusiasts.