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The planet can not support "billions more", it can barely support the billions we have. Maybe on a subsistence level of a basic minimum nutritional value it could theoretically, but not with industrial products, medicine, education, transportation infrastructure, energy, communications equipment and so on.

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Cultivated land is 11.6% of the world, and we can improve the agricultural output of land by a large margin just by adding greenhouses. PV could supply each and every person in a well-fed global population of 10 billion roughly a thousand times the current power use of the average American today — less if you limit your PV to just deserts, but still far more than enough for “modern” lifestyles.

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