1. First off, the vast majority of restaurants that I've been to that offer Impossible or Beyond Burgers still offer at least one traditional veggie burger. In fact I don't know if I've ever seen a restaurant that will only offer a faux meat burger but not offer a veggie burger.
2. I love a good Impossible Burger, fundamentally because it satisfies my cravings for meat in a way veggie burgers never do. Faux meat burgers have very similar protein/fat/carb ratios to real meat, while veggie burgers are nearly always a ton of carbs. I can eat an Impossible Burger and feel full for hours. I eat a veggie burger and I'm hungry again really quickly.