I don't know where you're from, but where I grew up meat was an occasional food. The diet was mostly vegetables/fruits/grain, with meat from hens/ducks once a month or so, cows and pigs were slaughtered right before winter so there was more meat during winter but still for a family of 5-8 that's like a serving or two a week.
IIRC that's the standard diet for millennia - mostly plants but still occasional meat.
I don't think humans are made for vegan diets, but the current consumption of meat is absurd - we're eating better than kings and nobility used to.
How is it possible that meat can be cheaper than vegetables, it's rather ridiculous. Industrial farms are quite literally animal Auschwitz, yet people don't see the problem with that because they're "just animals"? Funny how that works.
I think slowly raising taxes on meat would gradually lower demand, and soon enough, production. Can't see us getting off meat completely, maybe lab grown will be successful.