With every actions, there is a reaction. It's unfortunate they are loosing their jobs in an already difficult environment, that is never an easy pill to swallow for anyone and perhaps government financial help for re-training for new jobs should be in order. Is it a win for the environment? That's also debatable.
I don't think single use plastic should be banned anywhere, do they pose a problem? Yes. is it solvable? also yes. First, humans in general could be more conscious of their impact when they consume. Here in Canada, they are not outright banned but charge a small fee. For the last 3 or 4 years, we have been using reusable bags at least 2/3 of the time or no bag if we only have a few items, we probably represent the average shopper...all without being forced many are trying. However, everything divided into single portions with 4 levels of packaging is a far bigger problem than a grocery bag and that is the type of plastic that actually isn't recyclable grade most of the time.
Online ordering and overproduction of goods also poses a problem, #1 being over packaged #2 many customers will buy multiple things, then return what they don't want, for the unwanted brand new items to rot away in a landfill un-used, was it necessary? That's a far bigger waste problem and green house gas emissions than plastic bags.
RE: Plastic bag ban has negative consequences - is it worth it?