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The field is in such a state of uncertainty that anyone who says they can see the future is lying. Limitations notwithstanding. In a sense, your writing pointing to apparent limitations will inspire people to circumvent them in clever ways. Perhaps those will be new ways. Or not.
I think it requires guarded language by both. Skeptics can say “I don’t see X is possible!” and that raises a challenge. If particular skepticism motivates researchers, then it has impact (even if hard to measure).
Precise optimism is useful and falsifiable. Vague optimism is for fund raising. I would preach agnosticism. I search for limits and potentials. Predicted limitations and possibilities are interesting fodder for research if precise.
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