Solipsa -- I have to take issue with your white/black flight statement. Although the City of Chicago is losing people to the rest of the country, so is Illinois. This is a trend that has existed since the beginning of immigration in the US. States like New York, Illinois, and California act as "gateway states" into which recent immigrants move. Their children after a few generations then move on to less dynamic states.
It is inappropriate therefore to say that Chicago is still "losing people to the Suburbs" as its arguable that any outward trend is more than offset by an inward trend, It is more accurate to say Chicago, and Illinois in general, is losing people to the rest of the US, which is a trend that is much older than suburanization.