Pubes I don't have an argument!
I have a habit of a) not using plastic bags, b) making my own shopping bags from old clothing, curtains etc, c) making the same for other people. I have done all of that for decades. Not because I seek to be all warm and fluffy without actually engaging our brains and looking at the evidence. but because I think it is better than nothing. I have also explained that I never take extraneous food packaging home with me.
I have said, more than once, that charging for carrier bags is a start, an awareness raiser and that it is, in my opinion, better than nothing. Far batter than your attitude, which seems to be "I don't think it will work so I will nay say it and gently ridicule anyone who thinks it a good idea".
As for being able to scale up my recycled cloth idea, yes, we are there. Technologically we are and have been for centuries. For today's skill free population there are free patterns, tutorials and youtube videos, etc, that show how this can be done by anyone and everyone. All you need is some material (an old skirt, dress, a pillowcase, a pair of tattered jeans, an old coat, blanket, duvet cover, couple of teatowels, anything you can lay your hands on), a needle and thread and about 30 minutes from your undoubtedly busy life. The problem is that some people, like yourself, are waiting for someone else to do it for them instead of doing what they can as individuals.
Every great journey starts with a single step, as someone once said. Why are you so against this first step? What else should we be doing? Try to be specific.