Seems the heritage machinery and public interest are both still too occupied with old buildings whose heritage value you can supposedly gauge just by looking at them - antique buildings - to really move on to more modern stuff. There's the odd building, like Bata, that gets a public response, or the odd building that is near-immediately seen as worthy of protection (usually some kind of institution that isn't likely to be threatened, anyway). I guess the trick is to list or protect buildings faster than they reach the antique stage...that's the only way to keep up with trends and tastes or to be able to do anything proactively. Strawberry box bungalows will be antique buildings sooner rather than later, after all...it's not just about moving away from age but also responding to the fact that larger and larger quantities of buildings will soon become old (and what will we do with them?). If heritage staff are overworked, maybe hiring even 2 or 3 more people would make a huge difference...there needn't be some kind of massive effort or a billion dollar boondoggle or resources 'stolen' from other places to reach heritage goals, which always plays well with the public. Sneak a bit of heritage red tape in bit by bit over time and no one will really notice, anyway. If people suddenly must fill out an "HCD stroke 7465" form in triplicate if they need to replace a lightbulb in their suddenly heritage home, they're gonna get annoyed.
I wonder what will happen to neighbourhoods like Milliken in 50 years. North York bungalows on huge lots are prime targets for McMansionization, but Milliken's houses, on both sides of Steeles, offer tons of house on little land. It's easy to ignore these houses now because they're all pink brick with keystones, but, still, they're not likely to be threatened en masse. Something similar may happen with all those semi-detached houses near Jane & Finch...the house/lot ratio is fairly high and the dual-ownership makes replacement more difficult, so, again, there may no need to worry about those houses even if their heritage value goes way up in the future. Instead, the real threats may be to houses along Huntingwood or in central Etobicoke, just NW of the Kingsway...they're a bit older, on bigger lots, and typically bought by people who can afford more renovations.