I feel like the argument is simply embellished in order to support removing elevated highways like the Gardiner. I agree with hawc, despite wanting to see the Gardiner come down also. The Gardiner isn't nearly the barrier that Lakeshore Blvd is. I lived in CityPlace for years and it was always Lakeshore that felt like the issue, never the Gardiner (save for the crossing at the West side of Spadina under the Gardiner. Even the East side was easy to cross, with a Gardiner ramp right there. You simply look in one direction and cross. It's Lakeshore where you wait forever to cross, and then only get a short period of time before you have to wait again.
Even at Dan Leckie where there are no Gardiner Ramps, its a pain to cross. Lakeshore is too wide, and I'd hate to see it widened to accommodate the removal of the Gardiner. The best outcome in my opinion would be the removal of the Gardiner without having to accommodate extra traffic on Lakeshore.