Tbh I think you are overestimating the disruption, lots people do already buy washing powder in cardboard boxes(it's also a better product BC you buy it in bigger volumes and you can measure out the exact right amount for your machine and water hardness), picking your fruit from a loose box in the supermarket and putting into your shopping cart in a paper bag or a bag you bring yourself is also super normal, why would you have to make your own yougert? Why would you need to go to a creamry for cream rather than use the supermarket glass bottle return scheme used for milk? I feel like I should note that there a lot of food-safe resins and waxes that can liquid-proof containers that aren't actualy prohibitively expensive but a bit more expensive and currently less widely produced than plastics. But considering what we're doing to the planet that sacrifice is negligable

Yeah the pre-portioned and plated ready meals you buy from the fridge section would probably stop being thing, but there also food-bar things that serve a very similar product

Obviously life would change a bit and it wouldn't be painless but I really think people overestimate it and something absolutely has to change