We would need to have businesses that wanted to locate here for there to be office towers rising. That may happen someday, but it's hard enough getting businesses to move to Yonge & Eg or Yonge & Shep, let alone Shep & Bayv or Lez.
Someday,... really???
I've given up on someday,... many, many days ago,.... many, many moons ago,.... many, many years ago,... Why? Because even within North York Centre Secondary Plan area (Yonge corridor between 401 to Cummer/Drewry north of Finch) we've repeatedly seen residential condo tower built on prime site once zoned for office at intersection of major arteries with subway station (Menkes' GibsonSquare, EmpressWalk, 4800 Yonge (proposed), Tridel's HullmarkCentre (mix), Bazis' EmeraldPark),..... and even at locations for possible future subway stations (Aoyuan M2M, Plaza's 5888 Yonge (proposed), etc,....),.....
Now with all the prime corner location at major intersections serviced by TTC Subway Stations occupied by residential condo towers,..... where are the Office Towers supposed to be built,... when someday comes????? Somewhere? Or No-where????
Look at this Bayview Village site,... prime location for office is at southwest corner of site where they plan on building 2 residential condo towers with direct subway entrance!!!
Long term,.... only downtown get Office towers,.... the rest of Toronto end up being more and more strictly residential with pockets of Vertical Sleeping Communities,.... this isn't how you build a functional Urban City; this is how you build Vehicular & Transit congestion gridlock!