History will acknowledge that "vegan" was not a practical or pragmatic choice until recently. It still remains a philosophical choice available largely to the wealthy... or a necessity experienced largely by the poor. The developed nations aren't outliers; there's a pretty steady correlation between available wealth and available meat. The future will have less meat. The future will also have more viable meat alternatives. We don't look at the denizens of Victorian London as backwards defilers of the environment; we look at them as victims of circumstance. It'll be weird for children of the future to think that we used to eat bacon from the stomachs of pigs and drank milk that was harvested from cows but they won't blame us for it.
Yeah, I'm saying in a generation or 2 being vegan and/or eating lab grown meat will be the norm. And some old people are gonna cling on to the meat eating and defend it as the proper way of doing things. And talk about how back in our day, everyone wasn't a pussy that eats grass. But eh, that's what happens with all big societal changes.