Raising the minimum wage will accelerate what has been happening for the past couple of decades.
Read an article recently that each McDonald's franchise only has a profit each year of about $150,000.00. I had to check that number and other sources agreed that was correct. The level of profit is thin. Eliminating employee costs and improving efficiency could make that profit much better.
As to raising the minum wage:
First, while there is an increase in entry level wages, eventually wages for everyone increases to cover the increased costs for goods sold by companies that employee minimum wage workers. So in fairly short order the person that was making minimum wage today is back in the same position, they can not afford basic rent and other goods on minimum wage. This will happen regardless of how much minimum wage is increased.
All that setting a minimum wage does is establish the lowest cost you can get someone to perform a job. Any business will pass along that cost to their customers, they have to in order to stay in business.
So while there is a short term improvement in entry level wages eventually entry level wages only buy the same amount or less of goods they did before.
Second, increase the wages at that level and companies will automate. This will reduce the number of entry level jobs. Jumping to $15 an hour in a couple of years will accelerate the move to automate. All positions won't be eliminated immediately, but as automation improves more and more will be replaced.
Third, our economy is moving ever quicker to automated systems. There are fewer factory jobs because of automation. As automation is pushed into the service industries, there will be fewer and fewer jobs. Eventually, the vast majority of people will never have the opportunity to work.
This raises the bigger question, how do people live when there are no jobs? A huge welfare state is not sustainable. But many of our politicians want to try that. Once you run out of other peoples money the system collapses. We are not quite there yet but getting closer every day.
How do you organize a society where production of goods is primarily automated and most people don't work?