> If we are willing to use legislation, could we tax such gestation crates, and use that tax revenue to breed unconscious pigs? Or find a way to disable consciousness in their brain? Or fund lab meat?

This is the kind of "big government libertarian" thinking that you only find on HN. It's like virtue signalling but the virtue is contrarianism. What you've suggested is more complicated, less ethical, less effective, and likely to be opposed by just about everyone across the political spectrum.