I love this article where Allergy Eats founder, Paul Antico explores how much it's worth for restaurants to cater to those with food allergies. He's got it right on the money. Our family would frequent an allergy friendly restaurant and would avoid those restaurants with an allergy unfriendly attitude. Eating establishments can take small steps that would put those with food allergies at ease.
I think it's funny that when travelling, our most comfortable eating spot is McDonald's. Our dairy, egg, peanut and tree nut allergic child can have a regular hamburger, apple slices and a drink. We explain the situation to the cashier (or manager if we can't identify an allergy-friendly cashier). Most of the time, the manager or cashier will decide they will just make his meal. Other times they go back and explain to the "cook" that we need to have hands freshly washed (or new gloves put on) and for nothing else to be touched while the burger is being made. We can also see and hear what's going on, which is another comforting feature of McDonald's.
So truly, if McDonald's can take the extra steps to ensure a safe experience, surely other restaurants can too!