I look forward to a totally automated fast-food franchise in the near future. Like the procu-swine gristle-processing factories in Stainless Steel Rat, but with less cynicism.
How hard is it to thaw hamburger, squeeze it onto a steam-scalded griddle, flip it or press it between two hot surfaces, transfer in onto a bun with pump-and-tube condiment delivery systems, bag it and drop into a chute?
Even if it couldn't match the variety and customization of a McD's, it could deliver something at a great price? Since half of your happy meal cost is the price of the high school student standing there waiting for you to order.
Anyway, like it or not, I expect we'll be getting it sooner than later.