It makes no difference whether it was Roddenberry, NBC, or a combination of the two. You see in episode after episode a progressive, forward-thinking, racially and ethnically diverse perspective. You can call this the "Star Trek Vision" or the "Roddenberry Vision" or the "NBC vision," but either way that's the perspective that has been offered by Star Trek. They fuck it up sometimes, they come up short other times, but ultimately, that's the intent.
EDIT: And saying that Roddenberry wanted to portray a future where white people are the hottest shit ever based on the cast in The Cage is cynical and, again, ridiculous.