In some countries a "Go Bag" may be a good idea and in no way would I belittle any such preparation.
However, I think a "Stay Bag" is a far more useful concept especially for those of us in countries such as the UK. A good supply of food and materials kept in stock, not for some once in a lifetime event but for when there's more than an inch of snow lying outside and everything has ground to a standstill, or when you are ill and cannot be bothered to go out to the shops. I think the GB are just beginning to understand this, it was mentioned in one of their updates.
As others have mentioned, where are people going to go with their go bags? I remember in the 1970's the Fastnet Race disaster. I think about 14 or 15 people died. However, many abandoned their boats for a flimsy life raft only to die whilst their yacht remained afloat. It would have to be something very special to get me to leave the relative safety of home.
George