Pick a few good examples and preserve them (from an architectural viewpoint, some of the Atlantic Wall fortifications are remarkable!).
Sell the rest and let landowners decide what to do with them. I’ve seen Endicott Board fortifications converted into condos on Tybee Island, and WWII 16-inch gun emplacements converted into beach houses, and a post-Civil War magzine converted into living space / storm shelter on Sullivan Island.
Exactly
Agree totally.