I liked when the administration at the summer camp I work at banned them this past summer. This was for good reason, too, since those wonderful devices + steep, paved paths = a few hours at the nurse. If we happened to catch anyone using them (ie: if they're wheeling around, not if they're just walking, of course) most of us had our own little toolset on-hand. We'd take the student down to the office, pop out the wheels, and have their parent either pick it up after camp at the end of the week or mail the wheels home at the end of the summer.
That cut down on the stuff pretty quickly. Even still, it is great to work in retail where a parent walks off to shop, the child is left unattended and they take out an entire display because they thought that wheeling around was a good idea. Cleaning up is a pain but the look of shock, a satisfying "THUD!!", and the parent going "WHAT THE HELL IS WRONG WITH YOU?!" mostly make up for it.