Yes, I rely on business who accepting cash as well as card payment as both payment systems needed to be on going on to the financial sectors. Lots of people are working in such places where they paid in cash and they need to spend money on to market to buy their products. If all goes cashless then this groups of people will face difficulties.
Sometimes face difficulties to pay cash as some outlets not accepting cash and accept only cards.
Yes, Government should always require some places to accept cash. Specially at the supermarkets where people buy their groceries and in transportation.