Of course it’s about leadership. If the present leadership pushes oil, then guess what companies and people are going to use?
Also what do you mean “invent”???
Last time I checked we invented the nuclear reactor in 1943, and renewables have been around for decades.
Also there are many many substitutes to plastic in the world. They just aren’t used because plastic is cheaper. Make plastic less cheap? Well now the other materials look very very nice in comparison. Other then extremely niche cases, what materials cannot be substituted away from plastic? What roles can recyclable metal, paper, or plastic-like bio-film, not fill?
We could cut oil consumptions by factors of magnitude over the course of just a few years.