Tend to agree about people switching off the Viz warning. The amount of people now wearing hi-viz is increasing on what seems like a daily basis. Traffic wardens, lorry drivers, milk men, and the list goes on. Ive often thought that if it carries on increasing at the rate it is, we will start switching off and not noticing the difference. Glad i'm not alone.
On a side note, have you noticed the amount of cars that are now installing running lights? The same can happen there. At present a single headlight on a bike coming down the road is obvious. If all cars started running in daylight hours with lights on....would people stop noticing us?