It could be developed as part of a redevelopment of or addition to the 174 Spadina though, I imagine? If they decided to redevelop their site or add on to the existing building.
The area could also be adapted in the future for different uses as well, such as a patio space for a restaurant or cafe if they adapted the building to support that kind of use, or an area for food trucks or a landscaped amenity space for the adjacent building. It will also maintain some visibility of the nice old warehouse architecture and windows of 174 Spadina, so all in all I don't mind having a small gap in the streetwall here.