It will provide a nice symmetry to Toronto.
You have a major development at 2150 Lake Shore which can serve as Downtown West, then the main Downtown at the financial district and now East Harbor serving as Downtown East. They will all have GO Transit, and in the future Subway connections, etc.
If only they can develop Toronto North Station at Yonge and Rosedale so Bloor and Yonge can get GO Train as well and can become Downtown North.
In short, Toronto will have 4 Major Business Districts along with the mini ones that run up the spine of Yonge Subway at St.Clair, Eglinton and Sheppard.