It sounds a lot like you're advocating a new Star Trek series should serve in some way as a jobs program for out of work minority actors.
Which to me is beyond ridiculous.
No, it sounds like I'm saying that the casting process, like all employment processes, should be racially neutral and give equal opportunity to everyone. After all,
most actors are out of work at any given time. It's not remotely an easy profession to make a living in. So it's only fair to want every actor to have an equal chance.
And before you make assumptions about who's a "minority" in Hollywood, you should consider that non-Hispanic whites make up
only 29.4% of the population of Los Angeles as of a 2005-9 survey. It's a simple fact that the talent pool is ethnically diverse, therefore it logically follows, just as a matter of statistical sampling, that a fair and unbiased casting process would produce a diverse cast. I see that as a given and a non-issue.
Now, I'll grant that I may have misread your original post. It sounded to me like you were saying you wanted to see "diversity of values, morals, character, personalities"
instead of ethnic or species diversity, which I found very confusing, since there's no reason why that should be an either-or choice. But perhaps you just meant that the racial/species diversity is fine but is often used as a surrogate for more meaningful character diversity. Perhaps the emphasis implied by the thread title led me to focus on the wrong part of your actual point.
However, I'm not sure I understand the position that
Star Trek is lacking in diversity of values or personalities. There's always been a lot of variation between personalities -- as I said, that's kind of a given in any work of fiction with an ensemble cast. Kirk, Spock, and McCoy had very different personalities, and Spock and McCoy had wildly differing values. Worf's values and morals often differed from those of his crewmates. Data had a very different personality from Geordi. Sisko and Kira had very different beliefs and values. Bashir and O'Brien had very different, clashing personalities. Quark and Garak had very different morals from the Starfleet characters. Seven of Nine and the EMH had personalities that often clashed with those of their shipmates, and Seven's morals often clashed as well. Tuvok and Neelix had radically different and conflicting personalities. And so on. And of course the casting directors always try to find a diverse mix of personalities and talents so that the ensemble cast will be engaging to watch and the actors will stand out instead of blending together. (They don't always succeed in every case, but that's the goal.)
So I really don't understand the premise of your question. I don't think it's true that the franchise is lacking in character diversity, and there's no reason why it wouldn't feature ethnic and species diversity. So I just don't get where you're coming from here.