I agree that spires work best when the tower transitions into one. However, is tge sea of flat roofed supertalls that the Hudson Yards is becoming (30 Hudson being an exception), it would add more of that New York dynamic to the overall look of that skyline. The same thing applies to the CP tower.
I have always found this tower to be on the bulky side, now being joined by even bulkier towers like 50 Hudson and the Spiral, all with similar, flat roof heights. A spire here would shake it up a bit.
