Interesting, I guess it depends on where you are, because that's not how it seems to 'work' over here (Netherlands/Germany). Plenty of people buy vegan and vegetarian substitutes just to eat less meat. Both for health and environmental reasons.
Over the past few years there has been a big increase in plant-based products I can buy from the supermarkets. A decade back they had two types of soy-milk, now there is 30-40 types/brands/flavours of plant-based 'milks'. Even the big dairy companies are now actively marketing plant-based dairy.