Have you not been paying attention to what's been going on in extreme kayaking?  100 foot water falls, unbelievable runs on rivers once thought impossible.

I think the line is drawn in the sand (or surf, better).  It will only be a matter of time and we will see some WILD surf kayak photos of kayaks in these tubes.  I'm not the nut to do it, but some crazy 18 year old kid (maybe one of MY kids) will tear that wave UP.  Some of the kayaks I've seen are as fast as the board you see in those pix.  

Hell, it's probably already happening, whenever the boardies will let them in the line.

I hope your boast putting the child, car and house won't be considered legally binding!!!  ;)