To the degree that this is a risk, I'd note that airports and train stations tend to have a _large_ quantity of cameras in them; some of them owned by the airport operator, some by law enforcement, and some by lessees of retail space within the airport.
This problem is real, but it is better managed by creating massive, punishing fines for companies that engage in that behavior than it is by attempting to ban augmented reality devices (or laptops, or tablets, or phones, or any other camera-containing device).
This problem is real, but it is better managed by creating massive, punishing fines for companies that engage in that behavior than it is by attempting to ban augmented reality devices (or laptops, or tablets, or phones, or any other camera-containing device).