I think
@maestro made a good point about the current courtyard being underused. One of the problems, in my opinion, actually is CCS in its current iteration.
Unlike the TD Centre, where the courtyard is permeable in the north-south direction (the more useful mid-block connection for pedestrians given the width (east-west) of blocks in the Financial District, the Commerce Court courtyard is (easily) permeable only east-west. This makes it far less useful to pedestrians, thus less discovered & used. In my experience, the TD Centre courtyard is never empty, the Commerce Court one is empty frequently.
If this project can address that present failing of the courtyard, that would be a plus.
Also, while I won't comment upon the architectural style or significance of CCS and CCE, I do agree with those who are of the view that they do not address Wellington appropriately, making it one of the more dead blocks in the Financial District from the perspective of pedestrian street life.
These concerns could be addressed in ways that do not demolish and replace the existing buildings. However, if those buildings are destined to go, the opportunity should be used to fix the courtyard and Wellington streetfronts.