I find this topic to be very interesting.
It's useful to consider that by now, if somebody was going to white flight, they probably would already have, since its been in full force for about 50 years now. However, many of the never-fled class are by now very elderly and many have surely died off. The white population of Detroit is much older than the black population.
Another interesting factor is middle-class black flight, dating back about 25 years.
Finally, whites in traditionally white areas [[Warrendale, Far East Side, Southwest) have fled in very recent years.
With the boomers already having fled, though, the younger generation of whites don't have the same segregation prejudices as their parent's generations, coupled with viewing city living much more favorably than the older generation.
Regardless, the city is going to post a massive drop in population.
What I find most distressing about this census is that no ethnicity will be included. Therefore places like Hamtramck and Warrendale for example - with Poles and Arabs - with be classified under the same white label with no differentiation. So places like Hamtramck and Dearborn are going to look lily white on the census!