What I think will happen is that we won't reproduce how humans work in an McDonalds, we'll design new packaging/delivery mechanisms so that robots can deliver a Big Mac without having to do things like lift the burger from the freezer to the counter to the heating ovens to the table and finishing in the microwave.

Also - I would far, far prefer to order my food from a decent touch screen - I suspect the accuracy would greatly increase. (One of the best inventions ever in the takeout was the video screen showing you what the order taker thought you had ordered)