One of the issues that struck me with this concept is Security (apparently needs capital letter nowadays). By dramatically reducing a farm's footprint you're automatically making it an attractive target for terrorists.
Just imagine the scenario where terrorists simultaneously bomb a large number of these facilities. They would be able to wipe out a whole city's food supply in one go. Or worse, these facilities provide a central point that can be poisoned.
Not saying the security issue can't be overcome, but it will definitely have to be resolved, unlike with less obvious regular farms.
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One of the issues that struck me with this concept is Security (apparently needs capital letter nowadays). By dramatically reducing a farm's footprint you're automatically making it an attractive target for terrorists. Just imagine the scenario where terrorists simultaneously bomb a large number of these facilities. They would be able to wipe out a whole city's food supply in one go. Or worse, these facilities provide a central point that can be poisoned. Not saying the security issue can't be overcome, but it will definitely have to be resolved, unlike with less obvious regular farms.