Many supporters of the plan feel that creating the Square here results in more usable greenspace by connecting underutilized land in the rotary island to the surrounding parks and recreation areas rather than leaving it stranded and inaccessible. Other added benefits of the Square proposal include a new "front yard" for Franklin Park Villa to the south, and most importantly: safer crossings for pedestrians and cyclists throughout the intersection with significant traffic calming where a notoriously dangerous rotary now exists.
As in the other Annotated Casey blog entries here, these annotations are my own - and the pdf version linked is far easier to read.
The Casey Arborway Annotated: The Western End
The Casey Arborway Annotated: The South/Washington St. Corridor