I think this is a great option, and it would be great if more projects went in this direction in the future. Condo balconies are one of those things that are better in theory than in practice. At least in a climate like ours. People think of them as a "must have" in their imaginations but, when they actually move in to a unit, in most cases the balcony is extremely under used. In my building, I see hundreds of condo balconies all around me every day, and there is hardly ever a soul to be seen on any of them at any time. My own balcony is no exception.
So, imagine the benefits to be gained by having that much more extra floor space, with the option of a very wide sliding aperture to give you exposure to the outside at those times when you want it.
I think all condos in Toronto should be built this way.