This is the drop in the oceans. If people start to buy low single use plastic intensity products, the producers will start to reduce and it starts the pump for changes.
I feel like you have it backwards here. Consumers aren't the ones deciding how much plastic is in what. For example, I didn't decide that my new pair of scissors should come in large, impossible to open blister packaging. I didn't decide that my grocery store should only sell milk in large plastic jugs. And that's just going by the packaging I can see. Who knows how much disposable packaging is used throughout the production process.
I'm not saying that you shouldn't try to reduce the amount of plastic you use. But the end consumer wasn't responsible for the huge rise of plastic products, and there's only so much they can do to fix it.
Usually just buying less helps a lot.