Whilst ever we have people in the country who will work for whatever reasons for very little this problem will continue.
It brings my memory back to the 80's when shops were bringing in the Sunday working day.
In the shop I was in it was generally the younger people and students who would work Sundays, whilst older people like me refused it.
We knew what it would lead to and it was flat rate as well, where as in many jobs Saturday was time and a half and Sunday's double time
Back then it was a trial run - look where we are now with it!