I expect Canadian Tire to move to a "hybrid" model with most staff working more days from home. Workspaces will be shared. This will significantly decrease the square footage required. That being said, some space being leased at Y-E Centre no longer be needed and incorporated somehow to Canada Square.
Even with a hybrid model, there's still a need for more space at CT. Keep in mind that CT not only leases space at 2180/2190, but also throughout other office buildings in the area and GTA. CT REIT owns 50% of Canada Square, so the incentive to consolidate within the property is high.
You are correct about switching to a hybrid model though. The idea is complete flexibility for teams to choose the model that works best for them.