Personally, I think we haven't because we tend to be a reactionary species; we don't proactively go after problems. We haven't had the level of problems with our built environment that America has had since the foreclosure crisis. We had tighter banking regulations. We didn't have the mass exodus of people from urban centres in the same way they have. Although I think we're on the brink of some type of emergency in some communities in our country that are facing this sort of decline, we haven't hit that crisis mode, and unfortunately, I don't think we'll do it until we have to react to it.
On February 9th, 2017. See this statement in context.