Not only is it stupid for the govt to intervene, I think they are (again) forgetting the law of unintended consequences:
1. as long as bags are still available for a fee, people will use them out of habit and convenience and not bring their own recyclable ones
2. impulse shopping will be cut down if you have to plan to bring your own bags and want to avoid the fee
3. Some people say that paper bags are just as bad for the environment
This is nothing more than symbolic law making.