I believe that Obama would have to wreak much more havoc and damage than he's doing, to snap most blacks out of their Pavlovian conditioning.
That being said, I do believe that he's waking up a growing (but small) percentage of blacks who have never questioned the Democrat party in their entire lives.
May that percentage continue to grow.
From your lips to God’s ears. Things are transitioning for blacks in America with regard to party affiliation. I look at it as similar to the blue collar Democrats like my grandparents, who were conservative, church-going, family first people. They always voted Dem. because it was the thing to do - they were from the east coast and always worked as laborers in textiles or paper factories. My Grandfather changed when Ronald Reagan came along. The last Dem President he truly admired was JFK.