A clever idea. I took a look at the "101 video."
But very short rides and other much more "exhilarating" ways to enjoy rivers around here might not make Colorado the ideal market for this particular invention.
I would guess flatter regions with deep, relatively fast moving rivers might provide for a few hours of amusement though, or maybe wakeboard enthusiasts without a boat on some Class 2 river stretches will go for it, even in Colorado.
And I admit it may be more fun than it looks. I guess once you got the hang of it, you could repeat the rides pretty quickly, by never letting go of the board.
I suspect the board tends to drag and get slowed down in water a bit if you lose your grip. It probably doesn't sail through the air trying to crack skulls.
I could be wrong, so I would stay downstream just to be safe the first few times I watched someone do this up close.
Even with incredible success, I doubt there is any risk that we will have rapids and playparks disturbed by this activity.
Good luck to you. I hope you sell tens of thousands.