David,
basically you are right, no doubt.
but if you buy a oceanview condo which is not on the oceanfront, yes, than the owner of the property between your condo and the oceanfront may some day built something which takes your oceanview, but comparing that to the subject would mean that the person/company who sells you your condo could never give you a guarantee of your ?temporarily?oceanview, you would/should not pay extra to get such a promise.
if i buy property and somebody guarantees me access to a specific beach area, i would take care that such is in very clear words written in a contract, but i doubt that such exists/would be possible, because the beach areas are over there anyways not private (somebody mentioned above private beach, not existent there), they are public. what the subject is basically talking about is the access way, a walkway or street throu an other property, the one on the oceanfront which needs to get crossed by feet or car to reach that beach, and such could only guarantee by contract the owner of that specific beachfront property, not an other company/seller who sells condos in the 2nd/3rd/5th row(which i would name the newest parts of that white sands, because they are anything but close), and to guarantee such for lifetime would mean it would need to be written and sealed in the title of the oceanfront property, otherwise in case of change of ownership the new owner would just laugh in a visitors face who wants to cross his property to get beach access because of a simple contract of a prior owner. i follow the development of the white sands property stuff (the original and the name copies, in the area privately named traps by the same people making money, so named, not something i would say or could proof, not my business and not in my interest) since the earliest beginnings, i know several people living in both parts. i would not bet on any <crossing permission> to access that beach in the near/long future.
Mike