I hvae to disagree with those who think that Muirfield would plummet without bunkers. Most of them on that course are really eye candy, and the ones that matter (e.g. those in the elbows of 5, 8 and 17) could be easily "replicated" with natural grass faces humps and hollows. The key to this thought experiement (as with any course) is at the green sites. While Muirfield's do not have the natural contours at many other links courses, I do think that they are adequate enough to allow for the creation of significant non-bunker "hazards." Why, for example, would missing 11 long be any easier trying to get up and down out of a hard pan hollow than from the bunkers that are currently there?
The fascinating example that I am familiar with is Cypress Point. My first reaction is that sans bunkers the course would be like a 60-year old Mae West without any knickers. On reflection, however, I think that even CPC could be great de-nuded, if they could get it playing firm and fast.