I generally feel that if you like to sleep at night, business is not the way to go. I don't see how business people can just do one thing over a long time, and be sustainable. Rather, I see that successful business people (and I don't mean the outliers like Bill Gates) react to changes quickly and constantly adapt to new environments. The nature of their business always changes.

So we enter Business Continuity Plans. The businesses either had that, or they were diverse enough so that one leg failing doesn't mean end of the business.