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What you define as strong concepts, I see just as popular ideas with the 20th century western world. There's a different view of what is strong and weak, high or low brow, in other cultures.
And even accepting what you said, there had been a lot of similar fiction before Star Wars or Star Trek, and they utterly failed to become popular enough. When the concepts are similar in nature, what makes or breaks a franchise is the way the concepts are communicated. So again, "execution" is the defining thing here, because it can make any and all concepts seem like the most interesting thing ever, and if done badly it can butcher a story with a "strong" premise and plot.
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