If you're talking about the US, our plastic doesn't really end up in the Ocean. It's landfilled. We actually do have a ton of space that will last a long, long time. Not saying we shouldn't avoid unnecessary waste (drinking bottled water at home in places that are not Jackson or Jackson equivalent is largely just stupid; even if you think the tap water isn't good enough for some reason, you can add a filter to your sink, ice maker, etc.) but plastic waste is not to my knowledge an impending problem for humanity, at least in developed worlds. And in undeveloped worlds, I'm not sure plastic is the problem as much as just trash in general, but certainly if trash is going into the rivers and oceans, paper would be better than plastic.