This is one scheme for a Waterfront Drive extension cooked up as part of a previous transit planning exercise. It would require blowing up all of south PD. Something similar could be done though if the City so desired and still keep all of Higgins and everything to the north of it intact. This would be in a future major redevelopment scenario. IMO just planning to keep a piece of that current lot being redeveloped would be fairly minor thing to do.