Can an activist site change In-N-Out and other fast food menus?

Fans of California-based In-N-Out Burger are dedicated hamburger eaters. The chain’s simple menu – cheeseburgers, hamburgers, shakes and fries – has dedicated customers, one might even consider them cult-like in their love for the joint, that keep its empire growing on the west coast.
But a group a vegans and vegetarians have started a petition on Change.org to add a meat-free burger or a full meat-free meal.
The chain currently only offers non burger eaters a cheese sandwich o