Central to the controversy is the question of whether Adam’s Bridge is man-made or a natural formation.Hmm, so if it's a one-of-a-kind natural wonder, it's OK to destroy it. On the other hand, if it's man-made (and presumably could be remade someday if that strait is no longer used for shipping), it cannot be destroyed.
The possibility that no one seems to be considering is that it is both a natural and man made formation. It is not far fetched to think that man could have built up some or all of a natural formation to serve as a causeway. Also the fact that even today at low tide it lies in only two to four feet of water (except for two channels cut into it) might suggest that it could have also been used for fishing purposes. Kind of like a giant fish weir, the fish would be easy to catch as they crossed the shallow water.
Whether man made, natural or a combination of both, it does not seem unreasonable to relocate the shipping channel through one of the narrow peninsulas at either end.