The same can happen with any footwear change. Someone gets used to walking in 8in stilettos, well switching them to sneakers is gonna mess with their legs. It happens, and I agree completely, it is the consumers choice to select the footwear. The responsible companies try to inform the wearer, Merrell offers an iOS app to help, I know Vibram has a good bit on info on their website here ->
http://www.vibramfivefingers.com/education/index.htm. But I can definitely see someone walking into Dick's Sporting Goods, buying a pair of the File Skeletoes, and then wearing them with no thought or planning, they will definitely cause issues.
But we need to keep in mind that humans ran around without shoes for ages, so it's a matter of making the change properly, and intelligently.