Apart from all the valid comments upthread, your would look like a real dofus scooting around on one of those things. And at 3x faster than walking, you are going to be a moving liability, especially given how low to the ground you are. I can see airports banning this in short order....
Finally, walking is good for you and I for one love the walk to/from the gate, especially after being cramped for a 10+ hour TATL/TPAC.