My notion of how to address the feed supply issue is:

  1. Black Soldier Flies
  2. Duckweed
  3. Algae (Omega 3s)

All of the above are strong protein sources and duckweed and algae are fast growers and high density producers (at least an order of magnitude more than soybeans).

Obviously more effort is required to farm them but with automation it should require minimal labor.