So if the employees will be changed with machines, I think they lost their job. And with the less skills, they can't get any jobs from other employer. They can't do anything and the number of unemployed will raise higher
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.