You can replace most anything with wood or sheet metal. Not only that, but without subsidies to the fossil fuel industries, it would actually be cheaper to make many products we make out of plastic of wood or metal instead.

I wouldn't go so far as to say we need to ban plastics entirely. Expensive, long-lasting items like certain electronics (televisions, game consoles) are probably fine made of sturdy plastics (think the old stuff SNES's were made out of, not the brittle shit they make Xboxes out of today). And I'd have to guess there are certain electronic components that are best made of plastic and not likely to introduce any microplastics into people's systems.

What we need to cut down on are disposable plastics and plastics in food service. Styrofoam trays, plastic wrap, tupperware, plastic bottles, plastic grocery bags, plastic packaging, plastic dishes, plastic handles on silverware. All of these could be replaced with glass, metal, wood, or fabric and become more renewable/reusable/recyclable and less dangerous to people's health.