There is a risk (for fast food workers) that as wages rise, there is more of an incentive for employers to explore ways of replacing workers. For example, most people are capable of placing orders on a touchscreen device and seem comfortable with this process (as evidenced by self-checkout lanes at grocery stores). A fast food company who used to pay $8/hr for cashiers but is now paying $15 and maybe will pay $20 soon might find it more economical to replace 4 cashiers with touchscreen ordering stations.