Fun game to play.
Step 1. - Go and have a look at what billions of dollars of research funding has got us in the way of general purpose autonomous robots, I suggest this years DARPA challenge (the IEEE youtube vid of the failures is a good place to start.
Step 2. - Have another read of the reg article on Japanese research on how people (especially children) behave around robots (http://www.theregister.co.uk/2015/08/07/engineers_help_robot_escape_tots/)
Step 3. - Imagine sending one of the cutting edge DARPA challenge systems into a room with constantly changing layout and dozens of people. Load it up with hot liquids and sharp objects for added fun.
Step 4. - Check the BBC's guide to which jobs are most at risk and see that Waiter / Waitress is rated at 90% (it's quite likely).
Step 5. - Consider how much time, effort and above all else money, you are going to have to throw at this thing to prevent your restaurant being sued out of existence, in order to replace a bunch of people working for minimum wage plus tips.
Step 6. - Realise that most of the stuff being written is by people that haven't spent more than about 10 minutes with an actual robot, which was running a manufacturer's demo, in their life, let alone worked with one.
But I'm just bitter, being someone that has to do research with the bloody things, rather than get paid to write tosh as a "Robot Ethicist" or "Futurist" or whatever the hell these people like to call themselves this week.