Even if we had 100% recycling, most if not all forms of recyclable plastic can only be recycled once into the "Made from recycled materials" type of plastic which cannot be recycled again.
So the Oil industry will still have massive demand for new plastics if every piece of existing plastic got recycled only once. For recycling to work, we need a solution that makes it easy to re-use many many times.
This is why recycling really isn't the answer to solving the plastics crisis anyway
It's a bit more complicated I believe, because with each cycle the material loses some degree of quality, but there are several categories to begin with.
So the thin water bottles (PET) might be reused only once, but advanced plastic required by medicine containers, infant food packaging, or even thicker bottles, may get recycled multiple times.
So the Oil industry will still have massive demand for new plastics if every piece of existing plastic got recycled only once. For recycling to work, we need a solution that makes it easy to re-use many many times.
This is why recycling really isn't the answer to solving the plastics crisis anyway