Post-racial vision? Hardly.
"Trek creator Gene Roddenberry summed up his post-racial vision" doesn't make sense if several hundred years from now we still have the vast majority of the population in his future earth looking decidedly white, with some black, asian, etc. representation, when white folks are already a (fast shrinking) minority of the world's population.
Then again, while TV viewers accepted the first televised inter-racial kiss (Kirk / Uhuru) back in the '60s, a future where the majority, including the majority of those in positions of power, are not white is still unthinkable in western media, never mind 50 years ago.
The problem with stories of the future is we're still not very good at imagining it because we can't even see the present clearly, never mind understand it.