A few years ago I sold a chunk of land in order to diversify my family's holdings. Land prices have since sky-rocketed. I still contend that although "They don't make any more," land might some day be less valuable for food production.
Here is a radical possibility for food. It requires vastly less land than our current plant and livestock methods.
The Guardian: Embrace what may be the most important green technology ever. It could save us all.