Jim,
As you well know, there is no set number of bunkers that one should set out to incorporate but sometimes less is more and simpler is better. Once again, this a very subjective thing.
William,
The thing about golf courses is that whether we like it or not, they are always changing for all kinds of reasons. Furthermore, one of the reasons many classic golf courses get screwed up over time is because when they are changed, little if any thought is given to what was once there, why it was there, what was the design intent, how has it changed, and was that change for the better or for the worse. I've told the story here several times about the architect who did a master plan many years ago for my home club and finished the plan before ever asking or considering who the original designer was
This happens more often than you think.