First of all, McD is not even going to replace their (human) employees with robots, at least for the next 30 years. And by that time, the low skilled people will be able to find some other manual job, which suits them. They can't suddenly replace all their 2 million employees in a year or two. For heaven's sake it is impossible to manufacture that many robots, currently.
Yeah actually I didn't say the machine will replace
all of human employees in short time, and can you mention the other manual job that suit them ? I think all of the jobs will be replaced by machine too. Because what? Because....
Machines seldom makes mistakes (if they are programmed correctly in the first place). That is one of the advantages, when you replace humans with machines. The chances of error, are reduced to near-zero. The robots will misperform, only in cases of system hacks or any other serious issues.
So, I think the employer or businessman want to get more customers and gain higher profit right? Avoid humans errors with machines.