Calgary is not the only Canadian city that has been compared to Detroit.
http://www.troymedia.com/2014/11/20/...risome-future/
https://www.thestar.com/news/canada/...nidetroit.html
http://www.newgeography.com/content/...l-save-detroit
I think the first article raises a very important point, a city does die once the people stop believing in it. Times are changing for the better it seems, but Winnipeg seems focused on improving downtown and the suburbs, what about the in between? We could bring a new definition to the "donut-hole" city.
As much as hate to say it because I love Winnipeg, I still fear it could go the way of Detroit sometimes. It won't seem like it is declining, because our downtown will continue to improve and our suburbs will continue to grow. But, income inequality will continue to grow, and those neighborhoods in between the downtown area and the ~post-1970 suburbs will continue to decline, not necessarily in population, but overall quality of life. The life expectancy in Winnipeg's North End is 67, and in some suburbs as high as 83. Race tensions are also an issue, and as much as I hate that MacLeans had to sensationalize Winnipeg being "Canada's Most Racist City", which is also not quantifiable, its an issue nonetheless and not improving.
Calgary should it not learn the mistakes of single-industry cities, or attempt to further diversify its economy during times of "bust" will struggle if oil becomes a much less significant industry or if the Canadian oil industry fails to remain competitive.