I see it as an inflatable balloon, rather like the one that features in the Macy's Thanksgiving Day Parade.
Until it is filled with air, its full shape is invisible. Kermit, or Shrek, or Betty Boop, or one of the many other iconic figures who have featured in the parade, would be amputated, disfigured, if the balloon went up half-filled, or with one of its members stapled shut.
That's how I'm coming to see riding. Perhaps when our balloon is all filled up, a shape that includes riding will take form. At this point, I feel that if I go out and catch Gus, stick a saddle on his back, and mount up, our balloon might float - it might even look like something recognizable - but it won't be a glorious image, floating high above the crowd, making the assembled gasp, "Aaah!"