I absolutely agree. But that’s not what I was trying to say. Back to the Star Trek example - the TOS captain is an energetic Canadian playing an energetic American, the TNG captain is a middle aged balding Englishman playing a father figure-type Frenchman, DS9 has a black captain who is an ACTUAL father, VOY has a female captain who is a mix between a mother figure and a calm logical scientist (except the episodes when she’s Ripley), and Enterprise has a Kirk rip-off. If you go to Star Wars, the original trilogy’s lead is a young guy and he’s supported buy an “older brother”-type character, a wise old mentor, a princess, an alien and robots. The prequels have even more diversity. But now we get TFA which has a young woman as the main hero followed by Rogue One which has AGAIN a young woman as the main character. They’re just repeating the formula too soon - that’s the only thing which I was trying to say.
We have no idea what Felicity Jones’s characterization is going to be like, though. In fact, going by this trailer, I’d say it looks likely that she’s going to be quite a different sort of character from Rey (jaded, embittered revolutionary as opposed to hopeful, idealistic Force-adept). And going by your own Star Trek analogy, the age difference between Daisy Ridley and Felicity Jones is almost exactly the same as the one between Shatner and Stewart when they started their respective series.