Yeah, as long as the city doesn't own it, it might theoretically get developed one day, 'and there's nothing we can do about it,' but we need to distinguish between rather explicitly temporary "parks" like the dead grass at Bay & Dundas and whatever could get built at 1 Bloor (even it's the 1 Bloor East Botanical Gardens & Butterfly Conservatory) with ostensibly permanent parks that unexpectedly fall prey to development over time through municipal unwillingness or inability to fight for them...the city could have bought the site or denied approval or worked out some agreement, but didn't. The goal with 1 Bloor, should anything beyond a parking lot be built, is to avoid, as Ramako says, a future stink, and the best way to avoid future stinks is to not bother building a "park" and stick with a park[ing lot]. And, yes, it can be important to avoid stinks.