While I didn’t want to go into too much detail, the idea is to have an alternative to meat, when meat is either exorbitantly priced or scarce, both of which could happen in a serious depression.
But even worse, if there is an agricultural pandemic of the H5N1 influenza, whether or not it kills a vast number of people, it could also wipe out a vast amount of farm animals, leading to profound shortages of meat.
As an aside, I will note that Quorn has a major advantage over tofu in that it does not contain the high levels of plant estrogen that tofu does. While tofu is widely consumed without problems in southern Asia, this is because it has been fermented, which destroys most of the estrogen.
For this reason, it would be a good idea to limit intake of non-fermented tofu, as plant estrogen can cause severe health problems.