An increase in efficiency will consequently bring about a reduction in cost-per-watt due to lower production expenses than before. We probably don't need to fill up deserts (for residential/small-scale use anyway); maybe once the efficiency is high enough, you would be able to install a small unit on your rooftop for your own needs, or maybe a slightly larger unit which will power all the houses in your neighborhood, and you might even be able to charge your neighbors for using power supplied by you!
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An increase in efficiency will consequently bring about a reduction in cost-per-watt due to lower production expenses than before. We probably don't need to fill up deserts (for residential/small-scale use anyway); maybe once the efficiency is high enough, you would be able to install a small unit on your rooftop for your own needs, or maybe a slightly larger unit which will power all the houses in your neighborhood, and you might even be able to charge your neighbors for using power supplied by you!