I don't know details of the settlement and don't have time to look into it, but much is being made about the case being settled with many beach front homeowners “WITH PREJUDICE”. "WITH PREJUDICE" just means the case was decided based on the relevant law at the time and cannot be revisited based on the same set of facts and law. If the law changes the issue can be revisited depending on the circumstances.
Not an attorney but given that the law changed and the shoreline is a right that goes back to English common law, the settlement could be reviewable. Since our county attorney is the one that worked on the settlement it would be prudent for an outside firm to review to see if the settlement could be overturned and CU could be reinstated. You'd have no problem at all funding a legal review.