We were told the same nonsense when the $10 and $15 minimum wage was being discussed. Magically, the same guys bitching about $20 an hour were able to survive at $10 and $15 an hour. So you can shove that argument straight away.
What I do agree with is that doing it at one time--raising it right to 20 from what it was-- was flat out idiotic.
The folks who are REALLY going to be hurt are not the employees but the line managers. They are hopelessly screwed beyond recognition at this point. Ninety-nine percent of the work is done by the employees they bark at to work harder, come in when they are sick, or (my favorite) come in on your day off because someone quit. Well, now that platoon of blamable peons are reduced to the point to where you will have to man the grill or the fry station. When orders are wrong and customers are not satisfied, who you going to blame Judy?
So yeah, line managers are going to become endangered species at this point.