And yet....
Even knowing these things, I'm not a believer in the "cynical interpretation" of Roddenbury's vision. I think his optimism and humanism did have an essential impact on Star Trek. Yes, in the writers room, some people, like Ronald Moore, felt constrained by some of the things they were hearing from high up. Yet, many of the ideals that Roddenbury displayed resulted in television that bucked the norm, and presented an optimism for the future that is direly missing right now in television.
I mean watch the Writer's Room feature on TNG - Moore, Braga, Echievarra and Shankar may have resented not being able to kill off Riker and stuff, but ultimately being restrained by Jeri Taylor and Michael Piller and having the Roddenbury stuff coming down, resulted in a unique show. They all seemed to recognise this. And there were times when Battlestar Galactica, a show in which these impulses were un-restrained, developed into a soap opera as a result (like a lot of modern TV does, when you just have angst and conflict for it's own sake).