This is what happens when people condense ideas into simple phrases. The quote works great when describing things like marriage equality, but something like extra days off work for some people is different. The obvious solution is flexible holidays for everyone.
How can you possibly think the US military, or any sovereign country, will magically spend an extra $165B a year on meat a year if all of the current consumers magically go vegetarian? Who exactly is going to eat a bunch of extra meat? There will just be fewer meat sales, period, ignoring a short term price drop if everyone magically goes vegetarian on the same day.