Well said, Sci. I agree with your assessment of where Star Trek needs to go from here. Trek's optimism about the future sets it apart from almost every other franchise.
Thanks! Mind you, I don't think Star Trek should be unrealistically optimistic. I think that Star Trek has a responsibility to acknowledge the darkness of the times it lives in, and to avoid giving pat answers to hard questions. Star Trek should not depict utopia, and it should not depict its better future as being some sort of easy thing to have. The people in Star Trek should be facing many of the same problems we face today, because these are problems that will always be with us.
The difference should come in Star Trek's answers. Even if it has a darkness to it, Star Trek should always maintain its hope for a brighter, better future. DS9 can be a model for that -- for all its darkness, DS9 still believed in a better future, even when it acknowledge that that better future would not be perfect and that the people living there would still be deeply flawed.