I stopped eating meat over 2 years ago. I eat fish once in a while but mostly a vegetarian diet. I really miss being able to grab a quicky fast food meal. I never ate fast food all that much but it was handy on occasion when you're on the road or don't have time to stop for lunch but need to grab something. And I really miss sandwiches. The ease of some deli meat, cheese, lettuce and tomato...done. Most fast food restaurants have little to offer someone who doesn't eat meat.
I'd create a vegetarian/vegan sandwich fast food/drive through with really good healthy food. Falafal, several varieties of homemade veggie burgers with lots of toppings. Grilled veggie sandwiches and lots of really good bread. Just because it's veggie doesn't mean it has to be a wrap all the time. I miss really good bread! Crispy eggplant parm on crusty Italian bread. Oh yes!! And fresh pasta salads, potato salad, interesting side salads to go on the side.
Put these in every major city and in highway rest stops.