East Potomac is one that should actually happen. Sharp Park is one that can't be rebuilt exactly because of the sea wall and other constraints, but it can get back a lot of what was lost. Shawnee is one that I find interesting- although it would depend on them wanting to do it, which I have no idea.
I have looked at all of these, over the years.
East Potomac will be a huge project because of the seawall and infrastructure and where it is; it will take a lot for that to happen.
Sharp Park is impossible to truly restore, we will only be able to do 2/3 of it at most.
Shawnee was really the most intriguing to me, as it was Tillinghast's first course, and it's a great setting for golf. The ownership were pretty serious about exploring it back in the day. They never said why they didn't act on it, but I presumed it was because there was too much risk involved to close the course and rebuild it, when there was a possibility the next big flood would come along and you'd have to rebuild it again right after that. The time it makes sense to restore it is just AFTER the next big flood, but of course no one should wish for that.