I think that's a flawed analogy when applied to projects that will still take a long time even with the fast band-aid pull option. How long would it take to tear down the whole elevated portion and replace it with an at grade boulevard? 5-10 years? Imagine the chaos that would be caused without any access to both the Gardiner or Lakeshore during that period. At least when it's done in sections restricted access is limited to a much smaller area.
I disagree, I doubt there will be "chaos", and extending the construction for decades doing packets will cause more disruptions to traffic and the community. Starting and stopping projects will cause more confusion and demoralize the effected communities.