I don't think you understand the scale and flexibility of seaweed farming. But the feed itself is already poised to be adopted by large producers - https://www.bloomberg.com/news/articles/2021-09-09/world-s-t....

> it is not unrealistic for people to stop eating them

It's unrealistic to force them unless necessary.

Beef industry in some places is subsidized, demand can easily be curbed by removing subsidies or taxing. That isn't even on the table yet.