The employee-less shop is one step closer. Recently Amazon announced to open a grocery shop without check out lines. Now researchers at MIT have developed a robot-picker, that me used to stock shelves. We only need to add some kind of system to detect empty shelves, to run a shop without any human involvement.
The main benefit of a fully automated shop is the ability to operate shops around the clock and possibly lower prices for consumers. However, shop automation has a few drawbacks. First, it will increase unemployment. Also customers of an automated shop might be unable to ask question to staff. Of course, this issue might be solved in the (near) future as well.