Would it not be more feasible, more robust, and more effective to ensure diversity of thought for the future by building mechanisms into society to sustain them

Would it not be more feasible, more robust, and more effective to ensure diversity of thought for the future by building mechanisms into society to sustain them on their own (e.g., value and uphold communities that take both strongly positive and strongly negative views towards modernity) instead of relying on developing the technical ability to unfreeze people from the past and then promptly putting them to work in average jobs? (It seems silly, leaving aside the ethics of it, that we may find ourselves in the position of wishing we had the "diversity of thought" of peoples that we had long since either wiped out or pushed to assimilate into what's rapidly becoming a single global dominant culture.) I mean, it rather sounds like we have changed the pitch from "If you desire, you can avoid death" (and the specific form of "If you have a terminal disease at a young age, we can freeze you until the disease can be cured, so you can live out the rest of your life") to "It is good for society that we build mechanisms to clone large numbers of people from the past into the present to lead average lives," which at the very least is a whole different ethics ballgame. For one, there's the question of what happens if turns out that we can clone people from the past, en masse, even without them having been prepared specially. (Perhaps certain types of embalming cause enough stability in brain structure. Perhaps we can revive people who froze to death, like the hundreds on Mount Everest or similar mountains.) Going back to the idea that we only need a partial restoration and that there's no magical "self," is it ethical to clone them, if it is helpful to present society? Is it ethical to clone parts of them, if that's a technology we develop and it's beneficial? Also, it seems pretty unlikely that humankind is on its path to having a vastly lower population than we do today, and we have yet to be assured that we will be able to colonize other planets. Lives have value, but when we have reached the capacity of Earth, how do we weight the potential value of cloning millions of people rom the past?