This implies the assumption that these non-toxic materials that can replace plastics do exist.

I am very much _not_ a fan of plastics and try to mostly avoid them where possible. That said, I think these non-toxic materials do not really exist. I mean that in the sense, that consumer behavior can mostly remain the same when industry switches to the non-toxic materials.

People are used to the convenience of plastics. In many cases, there is just no non-plastic replacement. Think single use beverage bottles or other kinds of food packaging as the most relevant everyday item. The non-toxic alternative to plastic bottles would be glass bottles. But how many people will pick the heavy glass bottle over the plastic one? Problably single digit percentage. Because the lightweight plastic bottle is just very convenient.

And it's the same with many other uses of plastic. There are indeed non-toxic materials that could be used, but the overwhelming majority of people just chooses the more convenient (and likely also cheaper) product, which is usually made from plastic.