Yep, very good point. Home demolition is only accelerating and we're talking thousands of homes a year. They will be way close on Detroit proper's number by the end of the decade, but the accelerating home demolitions will most definitely throw off their estimates of the speed of decline each year. I think something noteworthy that was only given passing mention in the media, yesterday, is that they have Detroit more than halving its annual population decline over the years of the previous decade. Even if the estimates apportion too much population for Detroit within the county, you're still talking a substational slowdown annual slowdown in population decline.
Just to reiterate, though, my big concern is how this is throwing off the suburban estimates. It feels like they are making the same mistakes they did, last decade. Given that everything is returning to normal - by Metro Detroit standards, anyway - since the recession, it gets me worried they are providing false hope in some cases and feeding false negative narratives in others.
I mean, that they have a place like Canton declining from both 2010 and 2012 is enough to put every single sub-county estimate in the tri-county area in question. And, the reason they have Canton declining is really just because it happens to be in Wayne County. There is simply no way Canton is losing population. More generally, there is simply no scenario in which every municipality in Wayne County save for one is losing population, while every community in Macomb and Oakland County is growing. It's just not possible. It's possible that you've got cities like Pontiac, Mt. Clemens, Warren, Southfield, etc...slowing declines, maybe even posting very, very modest growths, but there is no way that they are growing
and you have a place like Canton and Dearborn losing population, or Livonia's declining accelerating.
Just to drive home the point, of the 714 cities found to have a population of over 50,000 in 2013, Dearborn had ranked 709 in growth (in this case decline) since 2010, a city the Census Bureau had found to be growing over the tough 2000-2010 period. They have this obviously growing city having lost 2,262 since the 2010 Census. And, for cities in Wayne County that may or may not be growing, but definitely aren't cratering, they have Taylor over this same period ranked 706 (-1,314), Dearborn Heights ranked 703 (-1,154), Westland ranked 699 (-1,519), and Livonia ranked 698 (-1,734). Whether these cities are growing or not, they obviously haven't lost this much population since 2010 in an improving economy, even if they aren't the growth areas they once were.
Anyone interested in seeing SEMCOG's more realistic estimates can go to:
http://semcog.org/Data/bycommunity.cfm
Closer to home, while they are much kinder to my city, they still have Lansing having lost 325 (-0.28%) people since the Census in a city that's probably added nearly as many housing units in these three years as the city did during the seven or eight years prior to the recession. And, they even have East Lansing having lost (they made the same mistake last decade when the city was found to have actually grown at the 2010 Census) despite adding even more housing units than Lansing. Neither of these cities have experienced mass demolitions, nor is there any reason to believe the age/family demographics of either city would account for any additional loss.