I love soybeans, eat em all the time.
Krill however...hmmm.
I dunno if Tofu is gross as most people make out. I can't say I've ever had any but I've heard that it really absorbs the flavor of what you cook it with.
Tofu on its own is actually very bland, and tends to take on the flavor of what you cook it in/with. I enjoy tofu myself, either in a nice broth or cooked in a little oil and maybe with a chili sauce. I think the people who don't like it probably are not put off so much by the flavor as much by the texture. It basically is soybean jello. That kind of freaks people out if they have been raised on roast and potatoes, but there are far stranger things that people eat on this earth to try to stay fed.
As far as the sixth world, lower cost foods are probably raised as much in tanks as they are in fields. Krill, fungus based protiens, algie and kelp, etc, are produced in tanks farms. Soy and corn would likely still be major field crops. Corn already is raised mosly for processing rather than consumption as a fresh vegtable. It is used to make sweeteners, thickening agents, in animal feed, as oil, and increasingly for industrial uses like fuel. Quinoa might take on more importance because like soy its a complete protien and fairly high in protien. Quinoa is also altitude and temperature resistant, so its likely to be grown in places where other crops don't do well.
Real fresh food starts to show up sporadically in middle lifestyle, but to be eating fresh veggies and real meat with most meals is something for High lifestyle or better. Still, that middle manager probably can afford a cup real coffee on sunday, an orange or some real eggs now and again for breakfast, and has a steak on his birthday.
As others in this thread have said, i think all the AAA corps would have at least some interest in food production. Its the one product that everybody needs no matter what.