A key question is will Republicans make a concerted effort to gain support among minorities. If they do, that will change politics going forward.
This is from the Gallup Poll.
This polarization could ease by the time Obama's term finishes, in three years. However, given the already large racial gap in party preferences in his first five years, unless there is a dramatic shift among whites toward the Democratic Party or among nonwhites toward the GOP in the next three years, party preferences will end up more racially polarized in Obama's presidency than in his two predecessors' administrations.