We need farmland to feed the population, and personally I think we need some forests and wilderness as well - for recreation, for the sake of the nature itself, ecosystems and biological diversity. Either we need to stack up people (high-rise apartments) or we need to become fewer people. How much area would we need for the population of Beijing if everyone was supposed to have a house with some land around? Not to forget that a sprawled population needs lots of areas for roads as well.
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I'm all for biodiversity and wilderness, sure stacking could be good, but won't the structures eventually need to be replaced? I just think the cheapest structures are single stories, or at least not sky scrapers, we probably could fit all the worlds population in a super tall building if we wanted to, I just think we still have plenty of space.