Didn't someone here (at TREKBBS) say the the network was all in favour of a multi-racial cast (assuming they didn't kiss anyone)
Surely GR would have been more worried about the suits in his 2nd pilot.
But really who knows what was going on at the time and how much GR made up to save face (understandably).
TOS was still pretty good overall IMO. If Martin Luther King told Nichelle Nichols to stay in Star Trek as a role model then who am I to argue?