I'm not a vegan or even a vegetarian, but the only times I really eat hamburger anymore are when I need a convenient meal while traveling and a plant-based alternative is not available.
Steak and other "whole" cuts are harder, obviously. But 40-45% of beef consumed in the US is ground beef[1], so cutting that by even half would get us half way there. And that seems entirely possible, even conservative, without coercion based on current consumer trends.
[1]: https://beef2live.com/story-ground-beef-united-states-128-10...