To be fair, we don't need it to overtake, or even come close to, the entire plastic industry. It'd already be nice if it, and other sustainable materials, could chip away at different uses of petroplastics.
I don’t know about printing but there’s various methods for liquifying and expanding cork. E.g. spray cork insulation and moldable cork ski boot liners.
It's orders of magnitude away from even taking out 1%.