I would expect if Amazon disappeared, since people can’t go there to search for products to buy anymore, they’d use Google instead, or some other product search aggregator sites. They’d presumably still list the cheap sellers first (or whoever pays for an ad slot). That would be a huge change in the e-commerce industry, FTC can argue it benefits consumers because the prices of everything will be cheaper without Amazon’s fees, but I’m not seeing how to reduces the prevalence of cloned products.