I'm skeptical that new materials like this will meaningfully drive down the demand for virgin plastic packaging. The problem is not just the absence of good alternatives; it's the fact that plastic is the fossil fuel industry's backup plan for the global transition to cleaner energy sources.

That is: in preparation for a decrease in global demand for energy from fossil fuels, the industry is ramping up production of plastic to compensate so that it can maintain profitability (instead of, you know, just slowing down the extractive capitalism). Plastic production is set to triple over the next few decades as new facilities are built to support this transition.

(Source: Paraphrasing from my vague recollection of A Poison Like No Other by Matt Simon, and also articles like this one https://www.ecowatch.com/plastic-production-pollution-foreca...)