Now that many older cartoons are being released with politically correct "warnings" by Whoopi Goldberg and Leonard Maltin, I see no reason that Song of the South couldn't be handled in the same way. I've heard uncomfirmed rumors that it may be release as a "Treasures" set in the way that other politically-incorrect Disney material has been released in recent years, especially since the WWII propaganda films with other racist undertones are now available.
I saw the film in its last theatrical release (1986) and have since aquired a . . .copy of the laserdisc Being that it's a period piece that takes place *after* slavery was abolished, there is no depiction of the "idylic slave-master relationship" as a famous reviewer once claimed.
And sadly enough, the symbolism of Uncle Remus is completely lost on those set against the film. The original stories (before adapted by Walt) were supposed to be a positive inspiration to slaves seeking their freedom. For example, the Tar Baby story was a warning for run-away slaves to be careful of getting caught because their appearance (yeah, it gets more involved than that).
Anyway, people should be allowed to see it for themselves and learn from our past rather than sweeping it under the rug and pretending it never existed.