You are incorrect. Because of past decisions, we have a population that cannot be supported without oil. Oil that will run out or become prohibitively expensive

You are incorrect. Because of past decisions, we have a population that cannot be supported without oil. Oil that will run out or become prohibitively expensive, some day. We have a moral imperative to find "the next technology." We may have more than a hundred years to do so, but your level of optimism in the timing does not change the morality of the imperative. (If you say "we'll always find new and cheaper ways of extracting oil," then you already agree with me, you just picked a different technology. We still have the moral imperative to find that technology.)