This is too far from happening here in my country but not impossible to happen. If they can implement this bitcoin as a payment then paying on restaurant is much easier and it is just like credit cards. Unless my country fully utilized the benefits of bitcoins then it will be a bigger help in other industries as well.
I don't think it will be much easier to pay in bitcoins on restaurant cause as you already know we are having a problem with confirmation time . Paying in credit/debit card takes a minute but bitcoin takes at least 3 minutes to confirm a block assuming that you pay a high priority fee . If the miner fee and confirmation time didn't improve itself, restaurants accepting bitcoin might be difficult to make it happen .