That's insane. Not sure what has already been built out of all that, but to do the same thing in Ottawa you'd probably have to flatten half the downtown core (not necessarily a bad thing, but ya know...).
It would be incredible for the city to have a large entertainment area like that. I imagine Rideau Centre, the conference centre, NAC, Chateau Laurier, Sparks St, and then a Sens arena taking up the SW corner, along with a few fill-in destination buildings in between creating a major hub in the city. Totally revitalize downtown. But I doubt it would ever happen.