Agreed, odds are good she’ll run as an incumbent in 2012.
The Dems won't do that, because they know that blacks will (rightfully) believe that the party power brokers have forced Obama out, so that they can run Hillary instead.
If the Dems were to pull something like this, black voters would boycott the 2012 election in protest, which of course, would lose them the election. It would also spell the end of the Democrat lock on that demographic.
Let's hope they're dumb enough to try it!