From having been known by our employee numbers, rather than our names, in the Saudi Oil Co, I've never considered it that far off when we will all be microchipped at birth, bringing us nicely into line with so many forms of animal control.
The essence of the idea isn't entirely bad. One of my ex-work colleagues' fathers died of hypothermia when rambling, confused, out in his PJs one snowy night. He was known to do midnight rambles at home with his family, but somehow he got out and died for it, being found on their driveway by the postman. There are so many people doing their nuts at home with demented parents who aren't always that old, that perhaps something like this would give them some peace of mind. My mother, in her nursing home, is regularly visited at night by the demented who have no idea whose room they're in - one of them (she couldn't see which gender!) tried crawling into bed with her at 3.00 a.m. a few nights ago. Imagine trying to cope at home with such sad cases, where escaping to the outside so often ends fatally.