Seems to me that high school and college kids are in class, usually between the hours of 8am-ish, and at least mid-afternoon. Who the hell is going to work the breakfast and lunch shifts if these jobs are "for high school or college kids."
College kids often have flexible schedules where they can work certain hours on certain days etc. Fast food places and many other min-wage or low wage places can work around those kinds of schedules, whereas other positions often can not. The statistics bear out that the younger set (school / college aged) were primarily the min-wage workers in the past. That has changed and is changing quickly.
You could make the same argument about buying stuff at the store, but Amazon is a dominant force. Human interaction might be important to some, but better prices with more efficient / quicker service will win over most. In fact, assuming the automated process produces similar food products, I'd prefer not to have to deal with dolts and just enter my order myself and have a robot prepare it correctly each time without screwing it up. I'm guessing most people share that opinion, but we'll see if that's true or not over the next few years.Also, I question the psychology of the customers - given a choice of seeing a person make their burger on a grill at a mom & pop restaurant, vs. a machine spitting out food, will a lot of the public get turned off by it? I think you still need some human aspect to the creation of the product for it to broadly appeal to the masses.
