Johnny M,
The folks at Pinehurst didn't seem to value the pedigree of Course #4 when they brought in Tom Fazio to replace the original Ross design (later revised by Roger Tufts and RTJ but it was still a Ross). Perhaps Fazio's course was meant to be a tribute to Ross, but...new routing, new holes, new concepts, new course.
Michael,
Muirfield and Shinnecock Hills are examples of world-class courses that are radically different from their original versions. The changes which resulted in their current configurations mostly occurred long ago, but they are examples of clubs that overlooked their pedigrees to the point that they ignored the original design. In Muirfield's case, it was (I believe) Colt & Alison replacing the original Old Tom Morris layout in the 20's. In Shinnecock Hills' case, it was Flynn replacing the original Macdonald/Raynor layout, although to be fair they really couldn't value their pedigree enough to protect the original design--it was a NY State highway expansion which ate into the property and necessitated the redesign.