So, just to humor me and my own POV, how would you interpret the following line of reasoning:
The removal of the Gardiner and subsequent development of the freed up lands would result in new communities, neighbourhoods and populations located in closer proximity to the downtown core who will not only come with great health and environmental benefits, it will contribute economically through private spending and investment, increased tax revenues and cultural production, but also represents a 'shift' away from suburban and car-oriented sprawl. Without these new developments, these future populations may otherwise locate themselves in suburban regions, costing our society due to sprawl and health/environmental related consequences, choosing to promote inefficient automobile-centric way of life and contributing further to road congestion across the city.
The problem with Regent Park and Robert Moses' highway building is that they both represented an old school of urban planning that presented an idealized version of what urban society
ought to be. New Urbanists make the same mistake very often by pointing at beautiful European cities and built forms and forcing 'planned' replicas or imitations be built here with no regard as to why those European cities and built form came to be in the first place. They do not have any regard for the needs of the population, only the aesthetics of the planned development, and that is where they, like the planners of Regent Park, will fail. The development on the waterfront on the other hand represents a different line of thought - allowing the market to decide the purposes and needs of the population and thus what gets built. This is why we have Southcore's condo towers with large podiums and big box stores at ground level rather than the mom&pop shops, the daily needs of the population demands the former. Similarly, on the macro level the market is shifting as society re-prioritizes their wants and needs, and they want to locate closer to downtown, they want to live in walkable communities, they want to walk/bike/take transit to work, they want to free themselves from the burdens of car ownership and commuting by car. The old model of suburban living with a lawn of grass and white picket fence is shifting away and the condo boom downtown is the market deciding what is to replace it.
You are very right to bring up the failures of the old school of urban planning espoused by Robert Moses and proponents of community housing projects everywhere, they are very relevant lessons today that to my disappointment I see many New Urbanists failing to grasp. I am steadfast in my belief that by not tearing down the Gardiner we are going against the economic needs and trends of our society. Retaining the Gardiner is in other words, imposing an unnecessary roadblock to the organic growth and transition of the market with an idealized version of what
ought to be without regard to the changing needs of society. Just like Regent Park and other misguided planned projects, retaining the Gardiner will be an ultimately unsuccessful exercise and a missed opportunity.
(Hehe, I just realized I made retaining the Gardiner sound like a socialist exercise, how do you like that pro-Gardiner conservatives?
)
P.S. You cited that other highway removal projects were just spurs and that those cities have other highways to compensate. I refer you to the Cheonggyecheon in Seoul, it was a big piece of infrastructure like the Gardiner, and its urban renewal has been an outstanding success. After Seoul removed the highway, downtown businesses reported increased value and efficiency and the city reported lower levels of congestion in surrounding roads and Seoul's downtown does not have other nearby highways.