> A lot of the program seems to have rested on subsidies and incentives, which are nice ways of saying you're relying on a profit or investment motive.

I mean that's just an implementation issue. To scale fast at that time, the government paid already existing corporations to build but kept ownership of the completed buildings. The point is that it's still a state venture and the profit motive/investment, "free market", was essentially suspended. So without this kind of government program the market, because of profit/risk/investment motives, won't build this.