[PeterisP]

IMHO price (or price/"performance") is a serious consideration for the actual food choices of many people, much more in practice than what they would say it is.

Currently, meat substitutes are effectively a premium product - however, if (when?) they would be available at half the price of animal protein, then I believe meat consumption worldwide would decrease a lot even if people's preferences would not change. Cultural norms would shift eventually, but that's slow, and price changes can happen and affect change much faster.